Merge branch '23500-enable-colorvariable' into 'master'
Enable ColorVariable in scss-lint ## What does this MR do? - Enable the ColorVariable rule in`.scss-lint.yml` - Change all color literals in `app/assets/stylesheets` to color variables ## Why was this MR needed? - Enforce the usage of color variables to better constrain the various color values being used ## Does this MR meet the acceptance criteria? - [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added - [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) - Tests - [x] All builds are passing - [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html) - [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides) - [x] Branch has no merge conflicts with `master` (if it does - rebase it please) - [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits) ## What are the relevant issue numbers? Closes #23500 See merge request !7319
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