Control subsection

[mistercrunch]

SUMMARY

Recent design proposals point towards removing the uppercase usage
across the board, and this PR starts the process with form labels.

it builds upon apache#24736 that
started to address hierarchy-is-unclear issue in Explore control panel
and makes things a bit neater on top of it.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

after

before

[mistercrunch]

Other forms affected ->

[codecov-commenter]

Codecov Report

Patch coverage: 25.00% and project coverage change: +0.01 🎉

Comparison is base (7675e0d) 68.94% compared to head (cc84ee1) 68.96%.

❗ Current head cc84ee1 differs from pull request most recent head 494b9e8. Consider uploading reports for the commit 494b9e8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #583      +/-   ##
==========================================
+ Coverage   68.94%   68.96%   +0.01%     
==========================================
  Files        1901     1902       +1     
  Lines       73898    73902       +4     
  Branches     8175     8175              
==========================================
+ Hits        50951    50966      +15     
+ Misses      20834    20817      -17     
- Partials     2113     2119       +6     

Flag	Coverage Δ
javascript	55.80% <25.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
...d/packages/superset-ui-chart-controls/src/index.ts	100.00% <ø> (ø)
...-chart-controls/src/sections/advancedAnalytics.tsx	14.28% <ø> (ø)
...rset-ui-chart-controls/src/sections/chartTitle.tsx	100.00% <ø> (ø)
...legacy-plugin-chart-partition/src/controlPanel.tsx	25.00% <ø> (ø)
...gins/legacy-plugin-chart-rose/src/controlPanel.tsx	50.00% <ø> (ø)
...gins/legacy-preset-chart-nvd3/src/NVD3Controls.tsx	100.00% <ø> (ø)
.../BigNumber/BigNumberWithTrendline/controlPanel.tsx	16.66% <ø> (ø)
...s/plugin-chart-echarts/src/Funnel/controlPanel.tsx	66.66% <ø> (ø)
...ns/plugin-chart-echarts/src/Gauge/controlPanel.tsx	66.66% <ø> (ø)
...ns/plugin-chart-echarts/src/Graph/controlPanel.tsx	21.42% <ø> (ø)
... and 15 more

... and 2 files with indirect coverage changes

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