fix(panel-plugin): don't load CSS file since it's loaded using css modules

[eh-am]

Otherwise grafana will try to load it and raise an exception.

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
webapp/public/assets/app.js	446.15 KB (0%)	9 s (0%)	919 ms (+3.38% 🔺)	9.9 s

[codecov]

Codecov Report

Merging #891 (5bc37ed) into main (0477cff) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #891   +/-   ##
=======================================
  Coverage   66.09%   66.09%           
=======================================
  Files          86       86           
  Lines        3120     3120           
  Branches      611      611           
=======================================
  Hits         2062     2062           
  Misses       1026     1026           
  Partials       32       32           

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[pyroscopebot]

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