chore: removing temporary_superset_ui folder (no longer needed)

[rusackas]

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

This directory is a vestige of the move to monorepo. Nothing in here should be active or needed any longer.

TESTING INSTRUCTIONS

Just make sure chart creation still works, particularly DeckGL :)

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

[codecov]

Codecov Report

Merging #18706 (11c4aea) into master (225015f) will not change coverage.
The diff coverage is n/a.

❗ Current head 11c4aea differs from pull request most recent head de73226. Consider uploading reports for the commit de73226 to get more accurate results

@@           Coverage Diff           @@
##           master   #18706   +/-   ##
=======================================
  Coverage   66.28%   66.28%           
=======================================
  Files        1605     1605           
  Lines       62863    62863           
  Branches     6341     6341           
=======================================
  Hits        41666    41666           
  Misses      19545    19545           
  Partials     1652     1652           

Flag	Coverage Δ
javascript	51.28% <ø> (ø)

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[zhaoyongjie]

LGTM!