Prevent collection issues with skip statements inside packages

[seifertm]

pytest-asyncio-0.23.4a2 suffers from a problem that causes tests to be skipped during the collection phase as described in
#729 (comment)

It turns out the tests were skipped, because the test suite in question used test packages and the first module inside the package issued a pytest.skip statement. The custom collection function for packages introduced in pytest-asyncio-0.23.4a2 tries to access Module.obj which triggers the pytest.skip and causes the collection of the package to abort.

Rather than trying to access Module.obj, this patch adds a package-scoped fixture to a stack each time a package is collected. The first module inside each package tries to pop an item from the stack and adds the popped loop fixture to itself.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (463ce98) 94.37% compared to head (e8e4dbf) 94.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
- Coverage   94.37%   94.33%   -0.04%     
==========================================
  Files           2        2              
  Lines         480      477       -3     
  Branches       97       95       -2     
==========================================
- Hits          453      450       -3     
+ Misses         19       17       -2     
- Partials        8       10       +2     

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