Auto merge of #96003 - aswild:pr/bootstrap-subcommands-cleanup, r=jyn514

bootstrap: consolidate subcommand parsing and matching

There's several places where the x.py command names are matched as
strings, leading to some inconsistencies and opportunities for cleanup.

* Add Format, Clean, and Setup variants to builder::Kind.
* Use Kind to parse the x.py subcommand name (including aliases)
* Match on the subcommand Kind rather than strings when handling
  options and help text.
* Several subcommands don't display any paths when run with `-h -v` even
  though the help text indicates that they should. Fix this and refactor
  so that manually keeping matches in sync isn't necessary.

Fixes #95937

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