tests: Remove unsupported replication tests

[ocean]

Summary by CodeRabbit

Documentation

• Updated documentation to clarify current capabilities and limitations with SQLite.

Tests

• Removed obsolete test modules from the test suite to streamline the test infrastructure.
• Updated test configuration to adjust which tests are excluded from running in both local and CI environments.

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[coderabbitai]

Walkthrough

This pull request removes two entire test files related to replication and savepoint replication features, updates test exclusion logic to skip Turso remote tests, and removes a documentation note about RETURNING limitations with SQLite. No functional code changes are introduced.

Changes

Cohort / File(s)	Summary
Documentation USAGE.md	Removed a bullet point documenting that update_all() with a select clause and RETURNING is not well-supported with SQLite
Test deletions test/replication_integration_test.exs, test/savepoint_replication_test.exs	Removed entire ExUnit test modules for replication and savepoint replication integration tests, including all test blocks, setup/teardown logic, and environment-based conditional connection handling (~767 lines total)
Test configuration test/test_helper.exs	Updated test exclusion logic to also skip Turso remote tests on both CI and local environments; minor wording adjustments in comments

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Bugfix queryable execute nil return #61: Modifies RETURNING behaviour for update_all/delete_all operations in the LibSQL adapter, directly related to the USAGE.md documentation change
• tests: Consolidate and simplify Elixir tests #56: Updates test suite structure and test exclusion logic in test/test_helper.exs, similar configuration-level test modifications
• Add replication tests #46: Added the replication test files and setup logic that this PR now removes, representing a reversal of those test module additions

Poem

🐰 Tests take flight, away they go,
Replication frames no longer flow,
Savepoints swept like morning dew,
RETURNING's note bids us adieu,
Cleaner paths for what's brand new! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately summarises the main change: removal of unsupported replication tests across multiple test files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch replication-test-fixes

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