Clean up remaining uses of testutil.subsystem.util and delete it. #10427
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Use v2 ways of getting subsystems instead.
In one case, modifies the is_python2 test to not
require a subsystem instance (of PythonSetup)
at all, since it really only needed it for the
compatibilities_or_constraints logic,
which is orthogonal to the is_python2 logic.
[ci skip-rust-tests]