fix: Loading state when cols for drill by are loading

[kgabryje]

SUMMARY

When dataset is still loading, drill by option should be enabled but a loading spinner should be displayed until columns are available

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2023-04-26.at.16.58.39.mov

TESTING INSTRUCTIONS

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

[lilykuang]

lgtm

[codecov]

Codecov Report

Merging #23830 (ffda33b) into master (40ae074) will increase coverage by 0.00%.
The diff coverage is 84.61%.

❗ Current head ffda33b differs from pull request most recent head 5efca21. Consider uploading reports for the commit 5efca21 to get more accurate results

@@           Coverage Diff           @@
##           master   #23830   +/-   ##
=======================================
  Coverage   67.99%   68.00%           
=======================================
  Files        1937     1937           
  Lines       74934    74937    +3     
  Branches     8138     8138           
=======================================
+ Hits        50954    50961    +7     
+ Misses      21895    21892    -3     
+ Partials     2085     2084    -1     

Flag	Coverage Δ
javascript	54.29% <83.33%> (+<0.01%)	⬆️
mysql	?

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

Impacted Files	Coverage Δ
...d/src/SqlLab/components/SaveDatasetModal/index.tsx	50.00% <0.00%> (ø)
superset-frontend/src/SqlLab/actions/sqlLab.js	66.33% <50.00%> (-0.17%)	⬇️
.../src/components/Chart/DrillBy/DrillByMenuItems.tsx	91.54% <100.00%> (+1.54%)	⬆️
...frontend/src/explore/actions/datasourcesActions.ts	100.00% <100.00%> (ø)
superset/views/core.py	75.11% <100.00%> (-0.21%)	⬇️

... and 8 files with indirect coverage changes

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