Skip streamz tests on windows due to tornado

[philippjfr]

Still having some issues with pytest-asyncio trying to shut down the event loop used by Streamz via Tornado. Tornado issues a ResourceWarning because the IOLoop adds a callback which never runs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.11%. Comparing base (400cc44) to head (74ccbf6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7604   +/-   ##
=======================================
  Coverage   82.11%   82.11%           
=======================================
  Files         340      340           
  Lines       51477    51483    +6     
=======================================
+ Hits        42271    42276    +5     
- Misses       9206     9207    +1     

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