fix(panel-plugin): remove leaky css

[eh-am]

fixes pyroscope-io/grafana-panel-plugin#7

We don't need that CSS anymore since we now ship all required css nested under a pyroscope css element.

Before:

After:

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
webapp/public/assets/app.js	490.47 KB (0%)	9.9 s (0%)	3.6 s (-21.71% 🔽)	13.4 s
webapp/public/assets/app.css	19.3 KB (0%)	386 ms (0%)	0 ms (+100% 🔺)	386 ms
webapp/public/assets/styles.css	9.52 KB (0%)	191 ms (0%)	0 ms (+100% 🔺)	191 ms
packages/pyroscope-flamegraph/dist/index.js	131.84 KB (0%)	2.7 s (0%)	1.6 s (-37.9% 🔽)	4.2 s
packages/pyroscope-flamegraph/dist/index.node.js	132.47 KB (0%)	2.7 s (0%)	595 ms (-20.8% 🔽)	3.3 s
packages/pyroscope-flamegraph/dist/index.css	8.3 KB (0%)	167 ms (0%)	0 ms (+100% 🔺)	167 ms

[codecov]

Codecov Report

Base: 66.24% // Head: 66.26% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (61e316a) compared to base (00a204f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1709      +/-   ##
==========================================
+ Coverage   66.24%   66.26%   +0.02%     
==========================================
  Files         165      165              
  Lines        5455     5464       +9     
  Branches     1221     1224       +3     
==========================================
+ Hits         3613     3620       +7     
- Misses       1835     1837       +2     
  Partials        7        7              

Impacted Files	Coverage Δ
...graph/src/FlameGraph/FlameGraphComponent/index.tsx	81.64% <0.00%> (-0.25%)	⬇️

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