refactor: split py_venv binary vs lib rules

[jbedard]

This way if the py_venv is not being exposed via py_binary(expose_venv) it will be a simpler rule only exporting the VirtualenvInfo and runfiles, no RunEnvironmentInfo or DefaultInfo(files)

Changes are visible to end-users: no

Test plan

• Covered by existing test cases

[aspect-workflows]

Bazel 8 (Test)

33 test targets passed

Targets

//examples/multi_version:py_version_default_test [k8-fastbuild]                               789ms
//examples/multi_version:py_version_test [k8-fastbuild]                                       841ms
//examples/py_venv:test_simple_binary [k8-fastbuild]                                          169ms
//examples/pytest/subdir:test_with_pytest_main [k8-fastbuild]                                 789ms
//examples/pytest/subdir:test_without_pytest_main [k8-fastbuild]                              229ms
//examples/pytest:absolute_main_test [k8-fastbuild]                                           267ms
//examples/pytest:chdir_test [k8-fastbuild]                                                   622ms
//examples/pytest:coverage_lcov_shape_test [k8-fastbuild]                                     1s
//examples/pytest:main_with_colon_test [k8-fastbuild]                                         442ms
//examples/pytest:pytest_test [k8-fastbuild]                                                  797ms
//examples/pytest:sharded/test [k8-fastbuild]                                                 2s
//examples/pytest:test_naming_723 [k8-fastbuild]                                              968ms
//examples/virtual_deps:pytest_test [k8-fastbuild]                                            1s
//py/private/py_venv:test_link [k8-fastbuild]                                                 492ms
//py/tests/console-scripts:test_console_scripts [k8-fastbuild]                                492ms
//py/tests/external-deps:test_can_import_runfiles_helper [k8-fastbuild]                       556ms
//py/tests/internal-deps:assert [k8-fastbuild]                                                348ms
//py/tests/interpreter-options:test_options_on_test [k8-fastbuild]                            362ms
//py/tests/main-from-genrule:main_from_genrule_test [k8-fastbuild]                            258ms
//py/tests/py-internal-venv:test [k8-fastbuild]                                               107ms
//py/tests/py-internal-venv:test_non_isolated [k8-fastbuild]                                  165ms
//py/tests/py-test:test_env_vars [k8-fastbuild]                                               331ms
//py/tests/py-venv-disable-systemsite:test [k8-fastbuild]                                     140ms
//py/tests/py-venv-disable-systemsite:test_non_isolated [k8-fastbuild]                        148ms
//py/tests/py-venv-disable-usersite:test [k8-fastbuild]                                       136ms
//py/tests/py-venv-disable-usersite:test_non_isolated [k8-fastbuild]                          130ms
//py/tests/py-venv-enable-site:test [k8-fastbuild]                                            130ms
//py/tests/py_venv_conflict:validate_import_roots [k8-fastbuild]                              658ms
//py/tests/py_venv_conflict:validate_import_roots_non_isolated [k8-fastbuild]                 474ms
//py/tests/repo_relative_imports/test:test [k8-fastbuild]                                     288ms
//uv/private/gazelle_manifest:test [k8-fastbuild]                                             800ms
//uv/private/markers:marker_arch_alias_test [k8-fastbuild]                                    374ms
//uv/private/sdist_configure:detect_native_test [k8-fastbuild]                                699ms

Total test execution time was 17s. 150 tests (82.0%) were fully cached saving 48s.

---

Bazel 9 (Test)

33 test targets passed

Targets

//examples/multi_version:py_version_default_test [k8-fastbuild]                               921ms
//examples/multi_version:py_version_test [k8-fastbuild]                                       905ms
//examples/py_venv:test_simple_binary [k8-fastbuild]                                          203ms
//examples/pytest/subdir:test_with_pytest_main [k8-fastbuild]                                 852ms
//examples/pytest/subdir:test_without_pytest_main [k8-fastbuild]                              367ms
//examples/pytest:absolute_main_test [k8-fastbuild]                                           313ms
//examples/pytest:chdir_test [k8-fastbuild]                                                   915ms
//examples/pytest:coverage_lcov_shape_test [k8-fastbuild]                                     621ms
//examples/pytest:main_with_colon_test [k8-fastbuild]                                         308ms
//examples/pytest:pytest_test [k8-fastbuild]                                                  444ms
//examples/pytest:sharded/test [k8-fastbuild]                                                 2s
//examples/pytest:test_naming_723 [k8-fastbuild]                                              576ms
//examples/virtual_deps:pytest_test [k8-fastbuild]                                            765ms
//py/private/py_venv:test_link [k8-fastbuild]                                                 524ms
//py/tests/console-scripts:test_console_scripts [k8-fastbuild]                                407ms
//py/tests/external-deps:test_can_import_runfiles_helper [k8-fastbuild]                       587ms
//py/tests/internal-deps:assert [k8-fastbuild]                                                496ms
//py/tests/interpreter-options:test_options_on_test [k8-fastbuild]                            399ms
//py/tests/main-from-genrule:main_from_genrule_test [k8-fastbuild]                            384ms
//py/tests/py-internal-venv:test [k8-fastbuild]                                               139ms
//py/tests/py-internal-venv:test_non_isolated [k8-fastbuild]                                  172ms
//py/tests/py-test:test_env_vars [k8-fastbuild]                                               330ms
//py/tests/py-venv-disable-systemsite:test [k8-fastbuild]                                     164ms
//py/tests/py-venv-disable-systemsite:test_non_isolated [k8-fastbuild]                        152ms
//py/tests/py-venv-disable-usersite:test [k8-fastbuild]                                       194ms
//py/tests/py-venv-disable-usersite:test_non_isolated [k8-fastbuild]                          129ms
//py/tests/py-venv-enable-site:test [k8-fastbuild]                                            137ms
//py/tests/py_venv_conflict:validate_import_roots [k8-fastbuild]                              604ms
//py/tests/py_venv_conflict:validate_import_roots_non_isolated [k8-fastbuild]                 637ms
//py/tests/repo_relative_imports/test:test [k8-fastbuild]                                     296ms
//uv/private/gazelle_manifest:test [k8-fastbuild]                                             661ms
//uv/private/markers:marker_arch_alias_test [k8-fastbuild]                                    294ms
//uv/private/sdist_configure:detect_native_test [k8-fastbuild]                                887ms

Total test execution time was 17s. 149 tests (81.9%) were fully cached saving 52s.

---

Bazel 8 (Test)

e2e

⚠️ Buildkite build #3912 failed.

Failed tests (5)

//cases/oci/py_image_layer:my_app_layers_test_test [k8-fastbuild]🔗
//cases/uv-deps-650/crossbuild:app_amd64_layers_test [k8-fastbuild]🔗
//cases/uv-deps-650/crossbuild:app_arm64_layers_test [k8-fastbuild]🔗
//cases/venv-bin-scripts-423:test [k8-fastbuild]🔗
//cases/venv-bin-scripts-423:test_non_isolated [k8-fastbuild]🔗

💡 To reproduce the test failures, run

bazel test //cases/venv-bin-scripts-423:test //cases/uv-deps-650/crossbuild:app_arm64_layers_test //cases/uv-deps-650/crossbuild:app_amd64_layers_test //cases/venv-bin-scripts-423:test_non_isolated //cases/oci/py_image_layer:my_app_layers_test_test

---

Bazel 9 (Test)

e2e

⚠️ Buildkite build #3912 failed.

Failed tests (3)

//cases/oci/py_image_layer:my_app_layers_test_test [k8-fastbuild]🔗
//cases/venv-bin-scripts-423:test [k8-fastbuild]🔗
//cases/venv-bin-scripts-423:test_non_isolated [k8-fastbuild]🔗

💡 To reproduce the test failures, run

bazel test //cases/venv-bin-scripts-423:test_non_isolated //cases/venv-bin-scripts-423:test //cases/oci/py_image_layer:my_app_layers_test_test

---

Bazel 8 (Test)

examples/uv_pip_compile

All tests were cache hits

1 test (100.0%) was fully cached saving 444ms.

---

Buildifier      Gazelle