chore: Adds the theme object to chart properties

[michael-s-molina]

SUMMARY

This PR adds the theme object to chart properties and adjusts the tests accordingly. This is a prerequisite for applying themes to plugins.

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests must pass

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 #19951 (032a23f) into master (e1f53f2) will decrease coverage by 0.00%.
The diff coverage is 57.44%.

❗ Current head 032a23f differs from pull request most recent head 15204a2. Consider uploading reports for the commit 15204a2 to get more accurate results

@@            Coverage Diff             @@
##           master   #19951      +/-   ##
==========================================
- Coverage   66.53%   66.52%   -0.01%     
==========================================
  Files        1714     1714              
  Lines       65044    65084      +40     
  Branches     6723     6725       +2     
==========================================
+ Hits        43278    43300      +22     
- Misses      20055    20072      +17     
- Partials     1711     1712       +1     

Flag	Coverage Δ
javascript	51.25% <43.33%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...perset-ui-core/src/chart/components/SuperChart.tsx	100.00% <ø> (ø)
...frontend/src/SqlLab/components/ResultSet/index.tsx	50.49% <ø> (ø)
...rset-frontend/src/dashboard/util/findPermission.ts	92.30% <ø> (ø)
superset-frontend/src/embedded/index.tsx	0.00% <0.00%> (ø)
...nd/src/explore/components/DataTablesPane/index.tsx	71.55% <ø> (ø)
...nts/ExploreAdditionalActionsMenu/ExploreReport.tsx	57.89% <ø> (ø)
...ntend/src/explore/components/ExploreChartPanel.jsx	70.49% <0.00%> (-1.18%)	⬇️
superset-frontend/src/preamble.ts	0.00% <ø> (ø)
superset-frontend/src/types/bootstrapTypes.ts	100.00% <ø> (ø)
superset/charts/api.py	85.93% <ø> (ø)
... and 17 more

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[villebro]

LGTM, exciting stuff!