Auto merge of #44983 - vitiral:dirty_clean_groups, r=michaelwoerister

groundwork for rustc_clean/dirty improvements

This is a WIP PR that needs mentoring from @michaelwoerister.

There are several TODOs but no outstanding questions (except for the main one -- **is this the right approach?**)

This is the plumbing for supporing groups in `rustc_clean(labels="...")`, as well as supporting an `except="..."` which will remove the excepted labels in the "clean" check and then assert that they are dirty (this is still TODO).

See the code TODO's and example comments for a rough design.

I'd like to know if this is the design you would like to do, and then I can go about actually filling out the groups and implementing the remaining logic.

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