Revert "[Manual Backport 2.x] Feat (core): Make theme settings user-specific and user-configurable (#5652) (#6681)"

[kavilla]

This reverts commit 815d2bd.

[codecov]

Codecov Report

Attention: Patch coverage is 62.26415% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 67.76%. Comparing base (8382e5c) to head (a9948e2).

Files	Patch %	Lines
src/core/server/rendering/rendering_service.tsx	29.41%	6 Missing and 6 partials ⚠️
src/legacy/ui/ui_render/ui_render_mixin.js	0.00%	6 Missing ⚠️
src/core/server/rendering/views/theme.ts	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             2.14    #6736      +/-   ##
==========================================
+ Coverage   67.73%   67.76%   +0.03%     
==========================================
  Files        3414     3413       -1     
  Lines       66941    66878      -63     
  Branches    10874    10867       -7     
==========================================
- Hits        45341    45321      -20     
+ Misses      18960    18895      -65     
- Partials     2640     2662      +22     

Flag	Coverage Δ
Linux_1	33.18% <12.50%> (+<0.01%)	⬆️
Linux_2	?
Linux_4	?
Windows_1	33.20% <12.50%> (+<0.01%)	⬆️
Windows_2	55.70% <54.16%> (+0.07%)	⬆️
Windows_3	45.25% <22.22%> (+0.01%)	⬆️
Windows_4	35.02% <17.02%> (+0.04%)	⬆️

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[kavilla]

failures unrelated