GitlabCI: Fix Stylelint validation errors

Quick follow-up on this issue:

Changes from MR!68 were ported to this ticket's merge request MR!84, from related issue 📌 GitlabCI support: Add config file and fix PHPUnit tests RTBC .

Fixed all stylelint validation errors based on report and required job to pass.

Last pipeline with stylelint job completing successfully:

• MR pipeline: https://git.drupalcode.org/issue/admin_toolbar-3462195/-/pipelines/227184
• Stylelint job: https://git.drupalcode.org/issue/admin_toolbar-3462195/-/jobs/2152031

 
We would greatly appreciate if a maintainer or someone with write permission could take a look at ticket's merge request MR!84 and let us know if there would be any more work needed.

Feel free to let us know if you have any questions or concerns on any of the changes in the merge request or any aspect of this ticket in general, we would surely be glad to help.
Thanks in advance for your feedback and reviews.

Stylelint gook good, CI passing, can we get it merged? this will unblock the Drupal 11 compatibility issue - 📌 Add Drupal 11 support Needs review .

Rebased MR!84 on 3.x with gitlabci tests and required stylelint job to pass.

✅ Merge request seems to complete successfully with all Stylelint validation errors fixed, see:

• MR: https://git.drupalcode.org/issue/admin_toolbar-3462195/-/pipelines/241700
• Stylelint: https://git.drupalcode.org/issue/admin_toolbar-3462195/-/jobs/2314984

Looks good! Merged.

Automatically closed - issue fixed for 2 weeks with no activity.