fix: remove SIP_34_ALERTS_UI from config

[nytai]

SUMMARY

#12085 removed all usage of the flag, but left a reference in config.py. This PR removes it to avoid confusion.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

• N/A

TEST PLAN

• Nothing should change

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12127 (ff61ee4) into master (8e625e0) will decrease coverage by 2.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12127      +/-   ##
==========================================
- Coverage   65.61%   63.34%   -2.27%     
==========================================
  Files         972      972              
  Lines       48071    48086      +15     
  Branches     4758     4784      +26     
==========================================
- Hits        31542    30461    -1081     
- Misses      16374    17435    +1061     
- Partials      155      190      +35     

Flag	Coverage Δ
cypress	?
javascript	61.96% <ø> (+0.01%)	⬆️
python	64.20% <ø> (ø)

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

Impacted Files	Coverage Δ
superset/config.py	90.51% <ø> (ø)
superset-frontend/src/SqlLab/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/dashboard/App.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/setup/setupColors.js	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/chart/ChartContainer.jsx	0.00% <0.00%> (-100.00%)	⬇️
superset-frontend/src/explore/reducers/index.js	0.00% <0.00%> (-100.00%)	⬇️
...et-frontend/src/dashboard/containers/Dashboard.jsx	0.00% <0.00%> (-100.00%)	⬇️
...-frontend/src/visualizations/presets/MainPreset.js	0.00% <0.00%> (-100.00%)	⬇️
...tend/src/dashboard/containers/DashboardBuilder.jsx	0.00% <0.00%> (-100.00%)	⬇️
... and 115 more

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