(temporarily) skip pending kernels unit tests on Windows CI

[Zsailer]

Unit tests that test pending kernels are failing on our Windows CI.

It will take me some time to investigate these failures, so I proposed temporarily skipping these tests in #672. We will keep that issue open to track updates in the future.

I've also changed the pytest logic a bit to be more explicit when testing MappingKernelManager vs. AsyncMappingKernelManager and use_pending_kernels.

[blink1073]

Thanks!

[codecov-commenter]

Codecov Report

Merging #673 (18f5ed3) into main (d201529) will decrease coverage by 0.90%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main     #673      +/-   ##
==========================================
- Coverage   77.76%   76.86%   -0.91%     
==========================================
  Files         110      110              
  Lines       10415    10070     -345     
  Branches     1403     1239     -164     
==========================================
- Hits         8099     7740     -359     
- Misses       1926     1936      +10     
- Partials      390      394       +4     

Impacted Files	Coverage Δ
jupyter_server/tests/services/sessions/test_api.py	96.55% <85.71%> (-0.05%)	⬇️
jupyter_server/tests/services/kernels/test_api.py	94.81% <87.50%> (-0.12%)	⬇️
jupyter_server/tests/services/kernels/test_cull.py	100.00% <100.00%> (ø)
jupyter_server/extension/handler.py	52.00% <0.00%> (-6.63%)	⬇️
...r/tests/unix_sockets/test_serverapp_integration.py	17.07% <0.00%> (-4.77%)	⬇️
jupyter_server/services/shutdown.py	66.66% <0.00%> (-3.34%)	⬇️
jupyter_server/gateway/gateway_client.py	72.89% <0.00%> (-3.30%)	⬇️
jupyter_server/files/handlers.py	26.08% <0.00%> (-3.08%)	⬇️
jupyter_server/terminal/api_handlers.py	85.00% <0.00%> (-2.50%)	⬇️
jupyter_server/base/handlers.py	63.10% <0.00%> (-2.42%)	⬇️
... and 56 more

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