Add support for specific inner build targets to graph build #12557
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Fixes #11922
Context
This change allows us to specify different outer and inner builds which is useful for pack.
Changes Made
I added a new concept of "inner" targets that are used for inner builds. I kept backwards compatibility with existing logic where by default, inner build targets are just the outer build targets + inner build targets.
If we specify:
Then the correct targets are scheduled:

Testing
I added a test and left the existing ones which verify that nothing changed for existing logic. I also tested manually with the provided projects in the linked issue.
Notes