ci: Add sysmon for coverage

[hoxbro]

See holoviz/holoviews#6465

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.72%. Comparing base (43761b8) to head (9cdfc76).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7616      +/-   ##
==========================================
+ Coverage   81.83%   86.72%   +4.89%     
==========================================
  Files         341      341              
  Lines       51661    51661              
==========================================
+ Hits        42275    44805    +2530     
+ Misses       9386     6856    -2530     

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