fix(chart-controls): temporal col placeholder for hybrid dnd

[kgabryje]

If ENABLE_DND_WITH_CLICK_UX feature flag is enabled, change the Time Column placeholder from "Drop temporal column here" to "Drop a temporal column here or click"
Fixes apache/superset#16307

[vercel]

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[codecov]

Codecov Report

Merging #1317 (8f7178a) into master (ff2309a) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1317      +/-   ##
==========================================
- Coverage   29.94%   29.93%   -0.02%     
==========================================
  Files         487      487              
  Lines        9840     9838       -2     
  Branches     1647     1648       +1     
==========================================
- Hits         2947     2945       -2     
+ Misses       6657     6656       -1     
- Partials      236      237       +1     

Impacted Files	Coverage Δ
...chart-controls/src/shared-controls/dndControls.tsx	37.83% <0.00%> (-1.06%)	⬇️
...gin-chart-pivot-table/src/plugin/transformProps.ts	42.30% <0.00%> (-2.14%)	⬇️
...s/plugin-chart-pivot-table/src/PivotTableChart.tsx	0.00% <0.00%> (ø)
plugins/plugin-chart-table/src/transformProps.ts	62.79% <0.00%> (+0.29%)	⬆️

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[henryyeh]

🏷️ 2021.31