chore: Enhance ReactChord style with theme vars

[geido]

SUMMARY

It enhances the ReactChord component style with theme vars.

BEFORE

DEV.Cross.Channel.Relationship.1.mp4

AFTER

DEV.Cross.Channel.Relationship.mp4

TESTING INSTRUCTIONS

1. No observable visual changes. Opacity might be slightly different to match the theme vars.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API
  q

[michael-s-molina]

LGTM. Left a non-blocking comment.

[codecov]

Codecov Report

Merging #19517 (cb3bb66) into master (0de03c4) will decrease coverage by 0.00%.
The diff coverage is 69.36%.

❗ Current head cb3bb66 differs from pull request most recent head 40fef59. Consider uploading reports for the commit 40fef59 to get more accurate results

@@            Coverage Diff             @@
##           master   #19517      +/-   ##
==========================================
- Coverage   66.59%   66.59%   -0.01%     
==========================================
  Files        1678     1682       +4     
  Lines       64242    64294      +52     
  Branches     6539     6554      +15     
==========================================
+ Hits        42784    42817      +33     
- Misses      19763    19776      +13     
- Partials     1695     1701       +6     

Flag	Coverage Δ
javascript	51.36% <67.92%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ugins/legacy-plugin-chart-chord/src/ReactChord.jsx	0.00% <0.00%> (ø)
...allel-coordinates/src/ReactParallelCoordinates.jsx	0.00% <0.00%> (ø)
...legacy-plugin-chart-sunburst/src/ReactSunburst.jsx	0.00% <0.00%> (ø)
...ugins/legacy-plugin-chart-sunburst/src/Sunburst.js	0.00% <ø> (ø)
...s/legacy-plugin-chart-treemap/src/ReactTreemap.jsx	0.00% <0.00%> (ø)
...plugins/legacy-plugin-chart-treemap/src/Treemap.js	0.00% <ø> (ø)
superset-frontend/src/SqlLab/App.jsx	0.00% <ø> (ø)
...d/src/explore/components/DatasourcePanel/index.tsx	69.23% <ø> (ø)
...end/src/explore/components/RowCountLabel/index.tsx	88.88% <ø> (ø)
superset-frontend/src/profile/App.tsx	0.00% <ø> (ø)
... and 13 more

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