feat(chart & legend): make to enable show legend by default

[prosdev0107]

SUMMARY

Enable Legend by Default

• For any new charts created that have a "Show Legend" option, enable it by default
• User should be able to see the legend checkbox checked and can disable it if they want

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

BEFORE:

screen-unable-legend-default.mov

AFTER:

screen-default.mov

TESTING INSTRUCTIONS

1. Create New Chart.
2. Go to Customize of Chart options
3. Find Show Legend or Legend Option

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

[Gwitchr]

LGTM!

[codecov]

Codecov Report

Merging #19927 (b8ddf58) into master (1fa841e) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #19927   +/-   ##
=======================================
  Coverage   66.51%   66.51%           
=======================================
  Files        1715     1715           
  Lines       65060    65060           
  Branches     6723     6723           
=======================================
+ Hits        43272    43273    +1     
  Misses      20076    20076           
+ Partials     1712     1711    -1     

Flag	Coverage Δ
javascript	51.26% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ns/legacy-plugin-chart-heatmap/src/controlPanel.ts	66.66% <ø> (ø)
.../legacy-plugin-chart-histogram/src/controlPanel.ts	60.00% <ø> (ø)
...gins/legacy-preset-chart-nvd3/src/NVD3Controls.tsx	100.00% <ø> (ø)
...frontend/plugins/plugin-chart-echarts/src/types.ts	100.00% <ø> (ø)
superset-frontend/src/SqlLab/reducers/sqlLab.js	33.15% <0.00%> (ø)
...frontend/src/SqlLab/components/ResultSet/index.tsx	50.49% <0.00%> (+0.49%)	⬆️

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