[v4.4] Use new global variables stylesheet in legacy promotions

[github-actions[bot]]

Backport

This will backport the following commits from main to v4.4:

• Merge pull request #5932 from mamhoff/better-promo-admin-colors

Questions ?

Please refer to the Backport tool documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.28%. Comparing base (5ce0c99) to head (0f5d280). Report is 2 commits behind head on v4.4.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v4.4 #5935 +/- ## ========================================== - Coverage 89.53% 89.28% -0.26% ========================================== Files 782 711 -71 Lines 17982 16174 -1808 ========================================== - Hits 16101 14441 -1660 + Misses 1881 1733 -148 ```

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