Merge branch '239861-remove-legend-unused-code' into 'master'

Remove unused legend css code

See merge request gitlab-org/gitlab!43275

app/assets/stylesheets/pages/pipelines.scss

@@ -1050,14 +1050,6 @@ button.mini-pipeline-graph-dropdown-toggle {
   line-height: 1.5;
 }
 
-.legend-all {
-  color: $gl-text-color-secondary;
-}
-
-.legend-success {
-  color: $green-500;
-}
-
 .test-reports-table {
   .build-trace {
     @include build-trace();