test: Add concurrent fixture teardown test for Hypothesis

[pankaj-bind]

This PR improves test coverage for the Hypothesis integration by adding a new test case for concurrent fixture teardowns.

The new test_hypothesis_concurrent_fixture_teardown test validates that async fixtures with teardown logic behave correctly when run alongside other concurrent tasks. This helps ensure the robustness of pytest-asyncio's fixture management in complex, real-world scenarios.

To accommodate Hypothesis's health checks for function-scoped fixtures, the test is decorated with @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.40%. Comparing base (3ab1fea) to head (8181308).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1190      +/-   ##
==========================================
+ Coverage   88.91%   89.40%   +0.49%     
==========================================
  Files           2        2              
  Lines         406      406              
  Branches       44       44              
==========================================
+ Hits          361      363       +2     
+ Misses         35       34       -1     
+ Partials       10        9       -1     

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[seifertm]

Thanks for the contribution.

I'm not sure if the new test is worth adding.

@pankaj-bind Can you explain what prompted you to write it?

[pankaj-bind]

Hey! Good question. I was thinking about potential edge cases and realized we weren't testing how async fixture teardowns behave when a Hypothesis test also runs other concurrent tasks.

It's not fixing a current bug, but I figured it would be a good way to make our test suite a bit more robust and catch potential race conditions in the future. Just a small addition to prevent future headaches! Happy to discuss it more though.