Fix validation of dependencies ignores breaking with generated subtargets #10407
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Problem
We eagerly validate that every
!is used in thedependenciesfield as a matter of good UX, because it's confusing how all the different pieces fit together.However, imagine this: you have a target that owns 5 files. You set on that target
!./bad.py. However, only one of those 5 files actually usesbad.py. This means that the 4 other generated subtargets would now all complain that the ignore!./bad.pyis unused.[ci skip-rust-tests]