chore: Removes hard-coded colors from plugin-chart-pivot-table

[michael-s-molina]

SUMMARY

Removes hard-coded colors from plugin-chart-pivot-table.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Check that the plugin is very similar to the previous version. We may have color, font, and opacity differences due to theme adjustments.

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

[codecov]

Codecov Report

Merging #19439 (40ecb58) into master (fa35109) will not change coverage.
The diff coverage is n/a.

❗ Current head 40ecb58 differs from pull request most recent head 10564e7. Consider uploading reports for the commit 10564e7 to get more accurate results

@@           Coverage Diff           @@
##           master   #19439   +/-   ##
=======================================
  Coverage   66.59%   66.59%           
=======================================
  Files        1670     1670           
  Lines       63888    63888           
  Branches     6510     6510           
=======================================
  Hits        42544    42544           
- Misses      19654    19655    +1     
+ Partials     1690     1689    -1     

Flag	Coverage Δ
javascript	51.33% <ø> (ø)

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

Impacted Files	Coverage Δ
...n-chart-pivot-table/src/react-pivottable/Styles.js	0.00% <ø> (ø)
...nts/controls/DateFilterControl/DateFilterLabel.tsx	41.41% <0.00%> (ø)

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[geido]

/testenv up

[github-actions]

@geido Ephemeral environment spinning up at http://54.244.28.23:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.