fix: Loading indicator of table and schema selectors

[michael-s-molina]

SUMMARY

Fixes the loading indicatos in TableSelector.

@serenajiang

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2021-10-08.at.3.35.45.PM.mov

Screen.Recording.2021-10-08.at.3.33.32.PM.mov

TESTING INSTRUCTIONS

Check the videos for 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

[serenajiang]

💯

[codecov]

Codecov Report

Merging #17040 (2c3a1d6) into master (e32a12f) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #17040      +/-   ##
==========================================
- Coverage   76.70%   76.69%   -0.01%     
==========================================
  Files        1031     1031              
  Lines       55155    55163       +8     
  Branches     7499     7501       +2     
==========================================
+ Hits        42307    42309       +2     
- Misses      12596    12602       +6     
  Partials      252      252              

Flag	Coverage Δ
javascript	70.86% <50.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...frontend/src/components/DatabaseSelector/index.tsx	91.56% <50.00%> (-3.44%)	⬇️
...et-frontend/src/components/TableSelector/index.tsx	75.24% <50.00%> (-2.31%)	⬇️
...c/dashboard/components/gridComponents/Markdown.jsx	83.49% <0.00%> (+0.32%)	⬆️

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[sadpandajoe]

🏷️ 2021.40