support pytest.skip() in subprocess tests in _compat_test.py #3947
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Adds support for pytest.skip() in subprocess tests in _compat_test.py.
Also adding a conditional skip for the g3 env, where importlib_metadata doesn't exist.
Note: while using strings might seem wonky, pickling exceptions to get over the subprocess boundary is a bit more complicated - especially for pytest's internal types over which we don't have too much control.