Add and use a an alias for Program types #15267
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+67
−75
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This is similar to the work I did using a
TypeAliasfor build targets, but for programs.There are more places we should be using this, especially in
build.py, but for the moment this is a good cleanup by itself, and will help us catch future regressions.I've marked the for 1.11, I don't expect (or want) it to land for 1.10