Revert 815d2bd7c612450e2a15a6543c7e74558adf4a81 "[Manual Backport 2.x] Feat (core): Make theme settings user-specific and user-configurable (#5652) (#6681)"

[seraphjiang]

This reverts commit 815d2bd on 2.x branch

We are lack of test coverage to release this feature. It should be ok to leave it in main. There is debt whether we should keep in 2.x. Since there is no clear plan for the test, the change is big. To avoid manual revert on every release (like what we did in 2.14), we'd like to revert on 2.x.

[github-actions]

❌ Invalid Changelog Heading

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[seraphjiang]

@joshuarrrr @ashwin-pc @ananzh @BionIT
feel free to comment if any question.

[codecov]

Codecov Report

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

Project coverage is 67.56%. Comparing base (f8d49d5) to head (84f0f20).

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.x    #6978      +/-   ##
==========================================
+ Coverage   67.49%   67.56%   +0.07%     
==========================================
  Files        3442     3441       -1     
  Lines       67868    67805      -63     
  Branches    11024    11017       -7     
==========================================
+ Hits        45805    45812       +7     
+ Misses      19399    19332      -67     
+ Partials     2664     2661       -3     

Flag	Coverage Δ
Linux_1	33.09% <12.50%> (+<0.01%)	⬆️
Linux_2	55.23% <54.16%> (+0.06%)	⬆️
Linux_3	45.21% <22.22%> (+<0.01%)	⬆️
Linux_4	35.03% <17.02%> (+0.04%)	⬆️
Windows_1	33.12% <12.50%> (+<0.01%)	⬆️
Windows_2	55.18% <54.16%> (+0.06%)	⬆️
Windows_3	45.22% <22.22%> (+<0.01%)	⬆️
Windows_4	35.03% <17.02%> (+0.04%)	⬆️

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch-Dashboards/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch-Dashboards/backport-2.x
# Create a new branch
git switch --create backport/backport-6978-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 87d9ee080699c4dcdd3783c6276a3e5762f45629
# Push it to GitHub
git push --set-upstream origin backport/backport-6978-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch-Dashboards/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-6978-to-2.x.