fix(io): tolerate broken symlinks when cleaning directories

[leno23]

Summary

Fixes #2135

CleanDirectory / CleanDirectories could fail on macOS when a directory tree contains broken symbolic links (e.g. Versions/Current in a .framework bundle pointing to a missing target).

This PR:

• Removes broken symlink directory entries without recursing into them
• Catches DirectoryNotFoundException / IOException during child cleanup and deletes the symlink entry when appropriate
• Handles missing file entries similarly during file deletion

Test plan

• Added DirectoryCleanerSymlinkTests.Should_Clean_Directory_Containing_Broken_Symlink_On_Unix (skipped on Windows)
• CI: Cake.Common.Tests

I do not have a local .NET SDK in this environment; tests were not executed locally.

Made with Cursor

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