Fix test-CI

[hoxbro]

Conda-forge now has playwright, though they patched it to remove the download option, and it only works on the UNIX system for now. For now, I will keep using the one from the Microsoft channel. It does seem like the conda-forge equivalent is called python-playwright.

Also, fixing the error shown in #6902

I think the failing test in test_param_generator is because we don't have an event loop, which takes time to start on CI, therefore missing the wait_until time.

[hoxbro]

The failing holoviews test is because of changes made in holoviz/holoviews#6256

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.56%. Comparing base (681ddc9) to head (feebdf3).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6909       +/-   ##
===========================================
+ Coverage   38.42%   81.56%   +43.13%     
===========================================
  Files         308      319       +11     
  Lines       45062    46915     +1853     
===========================================
+ Hits        17315    38264    +20949     
+ Misses      27747     8651    -19096     

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