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
These tests are known to only be executed partially or not at all. So
we always get incomplete, missing, and sometimes flaky, coverage in
the test functions that are expected to fail.
This change updates the ``coverage.py`` config to prevent said tests
from influencing the coverage level measurement.
Ref https://github.com/pytest-dev/pytest/pull/12531
