[Fix][Python] Use standard scikit-build directory

[tlopex]

This PR removes {wheel_tag} from the scikit-build build directory, solving the issue #19987 mentioned

Each cibuildwheel matrix job runs in an isolated environment, so separate tagged build directories are unnecessary. Using build restores the existing build/lib development layout expected by tvm.libinfo and fixes editable installs without adding runtime directory globbing.

[gemini-code-assist]

Code Review

This pull request updates the build-dir configuration in pyproject.toml from "build/{wheel_tag}" to "build". The reviewer raised a valid concern that using "build" can conflict with manual C++ builds by overwriting custom CMake configurations. They suggested isolating Python wheel builds by using a dedicated subdirectory like "build/wheel" instead.

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