chore: remove config of temporary_superset_ui

[zhaoyongjie]

SUMMARY

follow PR, then remove unused config of temporary_superset_ui

TESTING INSTRUCTIONS

CI

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

[villebro]

LGTM, assuming CI passes

[codecov]

Codecov Report

Merging #18708 (32721aa) into master (324a15d) will not change coverage.
The diff coverage is n/a.

❗ Current head 32721aa differs from pull request most recent head 9f8def1. Consider uploading reports for the commit 9f8def1 to get more accurate results

@@           Coverage Diff           @@
##           master   #18708   +/-   ##
=======================================
  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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