Revert "gh-132947: Apply changes from importlib_metadata 8.7 (#137885)" (#137924)

This reverts commit 5292fc00f29df60af82b55fca6c8b360e3667f96.

• Lib/importlib/metadata/__init__.py[diff]
• Lib/importlib/metadata/_adapters.py[diff]
• Lib/importlib/metadata/_collections.py[diff]
• Lib/importlib/metadata/_functools.py[diff]
• Lib/importlib/metadata/_meta.py[diff]
• Lib/importlib/metadata/_typing.py[Deleted - diff]
• Lib/test/test_importlib/metadata/_path.py[diff]
• Lib/test/test_importlib/metadata/fixtures.py[diff]
• Lib/test/test_importlib/metadata/test_api.py[diff]
• Lib/test/test_importlib/metadata/test_main.py[diff]
• Lib/test/test_importlib/metadata/test_zip.py[diff]
• Misc/NEWS.d/next/Library/2025-08-17-10-22-31.gh-issue-132947.XR4MJ8.rst[Deleted - diff]