Looking at PR 14702, I would much rather update what `-m test --pgo` does than make this exclusive to Makefile.

Back when we added the --pgo flag, the intent was always to move toward an equivalently good profile, but for practical reasons we settled at the time for "skip tests that break PGO".

I know that will make the change far more skips throughout the test suite, so perhaps we want to change how --pgo works completely, but it would certainly be better to make --pgo do what it advertises than have multiple lists of PGO profiles.