Merge branch 'rliu-gitlab-ui-integration' into 'master'

Use gitlab-ui classes instead for billing page

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144627



Merged-by: Jannik Lehmann <jlehmann@gitlab.com>
Approved-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Approved-by: Jannik Lehmann <jlehmann@gitlab.com>
Reviewed-by: Jannik Lehmann <jlehmann@gitlab.com>
Co-authored-by: rliu-gl <rliu@gitlab.com>

app/assets/stylesheets/utilities.scss

@@ -152,25 +152,3 @@
     margin-right: auto;
   }
 }
-
-/*
- * The below style will be moved to @gitlab/ui by
- * https://gitlab.com/gitlab-org/gitlab-ui/-/issues/2497
- */
-.gl-bg-purple-500 {
-  background-color: $purple-500;
-}
-
-.gl-border-purple-500 {
-  border-color: $purple-500;
-}
-
-.gl-border-purple-500\! {
-  border-color: $purple-500 !important;
-}
-
-.gl-text-purple-500 {
-  color: $purple-500;
-}
-
-/* End gitlab-ui#2497 */