fix(sqllab): reverts #21141

[justinpark]

SUMMARY

This reverts #21141 because of initial database selection has gone.
I'll work on database selector side effect clean up and then re-merge this.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

1 - Execute all tests
2 - All tests should pass

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

[justinpark]

@ktmud when you have a chance, please stamp and merge this revert.

[github-actions]

Storybook has completed and can be viewed at

[codecov]

Codecov Report

Merging #21174 (d8d7e73) into master (ed6212a) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #21174   +/-   ##
=======================================
  Coverage   66.39%   66.40%           
=======================================
  Files        1781     1781           
  Lines       67874    67874           
  Branches     7239     7239           
=======================================
+ Hits        45067    45069    +2     
+ Misses      20949    20946    -3     
- Partials     1858     1859    +1     

Flag	Coverage Δ
javascript	52.31% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...et-frontend/src/components/TableSelector/index.tsx	78.26% <ø> (ø)
superset-frontend/src/SqlLab/actions/sqlLab.js	61.37% <0.00%> (+0.26%)	⬆️
...d/src/SqlLab/components/SqlEditorLeftBar/index.tsx	50.00% <0.00%> (+1.51%)	⬆️

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