Clean artifacts with new layout

[charmitro]

Add cleanup for hashed example files, depinfo, debug files, and incremental compilation outputs when using cargo clean -p with -Zbuild-dir-new-layout.

The new layout was missing glob-based cleanup for:

• Hashed example artifacts in build_dir().examples()
• Rustc-generated depinfo (.d) and debug files (.o, .dwo, .dwp)
• Incremental compilation files in build_dir().incremental()

Closes #16302

@epage had this in my stash, so let me know if I'm doing something you're already in progress of doing.

[rustbot]

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[charmitro]

Closing in favor of #16302