Fix internal error caused by pytest.skip statements

[seifertm]

Accessing pytest's module Module.obj to attach a scoped event loop fixture triggers a module import executing module-level statements. A module-level pytest.skip statement raises the Skipped OutcomeException or a Collector.CollectError. These cases are handled correctly when they happen inside Collector.collect(), but the scoped event loop is attached in pytest_collectstart which runs before the actual collect call. This causes pytest.skip statements to trigger a pytest INTERNALERROR.

This PR catches the exceptions and aborts the attachment of the scoped event loop fixture to the module. Since all tests in the module are skipped, a missing module-scoped loop shouldn't be an issue, because there are no tests that can potentially request it.

This is essentially the same approach as in #656
Resolves #701

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0b34e8e) 94.81% compared to head (1f8ea0f) 94.86%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #702      +/-   ##
==========================================
+ Coverage   94.81%   94.86%   +0.04%     
==========================================
  Files           2        2              
  Lines         463      467       +4     
  Branches       92       92              
==========================================
+ Hits          439      443       +4     
  Misses         16       16              
  Partials        8        8              

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