chore(core): add ENABLE_DND_WITH_CLICK_UX ff

[kgabryje]

Add ENABLE_DND_WITH_CLICK_UX in order to hide features introduced in apache/superset#16119 behind a feature flag

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[villebro]

LGTM, although I personally prefer to make this part of the regular dnd feature

[codecov]

Codecov Report

Merging #1297 (aeef568) into master (7a76537) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1297      +/-   ##
==========================================
- Coverage   30.04%   29.98%   -0.06%     
==========================================
  Files         485      485              
  Lines        9753     9805      +52     
  Branches     1620     1639      +19     
==========================================
+ Hits         2930     2940      +10     
- Misses       6596     6633      +37     
- Partials      227      232       +5     

Impacted Files	Coverage Δ
...ackages/superset-ui-core/src/utils/featureFlags.ts	100.00% <ø> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	44.89% <0.00%> (-9.54%)	⬇️
...gin-chart-echarts/src/Timeseries/transformProps.ts	46.37% <0.00%> (-9.18%)	⬇️
...ugins/plugin-chart-echarts/src/Timeseries/types.ts	100.00% <0.00%> (ø)
...s/legacy-plugin-chart-country-map/src/countries.ts	0.00% <0.00%> (ø)
...s/plugin-chart-echarts/src/Radar/transformProps.ts	0.00% <0.00%> (ø)
.../legacy-plugin-chart-sankey-loop/src/SankeyLoop.js	0.00% <0.00%> (ø)
...ugin-chart-echarts/src/Timeseries/controlPanel.tsx	40.00% <0.00%> (ø)
...erset-ui-chart-controls/src/components/Tooltip.tsx	20.00% <0.00%> (ø)
...chart-echarts/src/Timeseries/Area/controlPanel.tsx	50.00% <0.00%> (ø)
... and 4 more

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