TEST: Accommodate pytest 8 changes

[effigies]

In earlier pytest, the following would "xfail":

@pytest.mark.xfail(raises=SomeException)
def example:
    with pytest.warns(SomeWarning):
        raise SomeException

Now, the failure to raise SomeWarning prior to raising an exception causes the test to fail in an unexpected way, presumably due to the order of exception chaining.

This PR adjusts our expected warning check to be disabled if an exception is expected to come first.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.25%. Comparing base (5d884bd) to head (cff2936).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1297      +/-   ##
==========================================
+ Coverage   92.23%   92.25%   +0.01%     
==========================================
  Files          99       99              
  Lines       12461    12467       +6     
  Branches     2562     2563       +1     
==========================================
+ Hits        11494    11502       +8     
+ Misses        643      642       -1     
+ Partials      324      323       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.