[python] Add --maxfail=50 to GHA pytest invocations

[ryan-williams]

Mitigate excessive logspam on PRs where many tests fail.

Multiple GHAs recently have failed with a huge amount of logspam, such that my browser tab never finishes loading the page, or any of the logs.

Here's an example, from #3001; downloading its logs:

j=30280188276
gh run view -j $j --log > $j.txt

Shows 472k lines / 77MiB. It looks like 482 test failures, some of which output ≈700 lines each.

The PRs where I've seen this recently have generally involved changing Python or Typeguard versions; Typeguard issues can cause large numbers of test cases to fail very verbosely.

This gist has the first 10,000 lines from the example above:

gh run view -j $j --log | head -n 10000 | gist -opf $j.txt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.79%. Comparing base (11d5396) to head (5bc1aa2).
Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3034      +/-   ##
==========================================
+ Coverage   89.64%   89.79%   +0.14%     
==========================================
  Files          40       40              
  Lines        4096     4096              
==========================================
+ Hits         3672     3678       +6     
+ Misses        424      418       -6     

Flag	Coverage Δ
python	89.79% <ø> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
python_api	89.79% <ø> (+0.14%)	⬆️
libtiledbsoma	∅ <ø> (∅)

[johnkerl]

🔥