🧪 Hide false negative warnings by coveragepy (#16021)

They are only surfaced under pytest 8.4, with `pytest-cov` and
`pytest-xdist` being both active [[1]]. Or equivalent situations

This is a follow-up for #16015 which attempted ignoring the warning
on the runtime level in pytest. Instead, the patch tells `coveragepy`
not to emit said warnings in the first place.

[1]: pytest-dev/pytest-cov#693

pytest.ini

@@ -15,9 +15,6 @@ markers =
 filterwarnings =
   error
 
-  # Breaks coverage combined with pytest-mp, surfacing as an unhandled error outside of test scope
-  ignore:Module awx was previously imported, but not measured:coverage.exceptions.CoverageWarning
-
   # FIXME: Upgrade protobuf https://github.com/protocolbuffers/protobuf/issues/15077
   once:Type google._upb._message.* uses PyType_Spec with a metaclass that has custom tp_new:DeprecationWarning