Merge branch 'dbodicherla-update-environments-dropdown-header' into 'master'

Update environments dropdown header

See merge request gitlab-org/gitlab!24096

app/assets/stylesheets/pages/prometheus.scss

@@ -47,6 +47,7 @@
 }
 
 .prometheus-graphs-header {
+  .monitor-environment-dropdown-header header,
   .monitor-dashboard-dropdown-header header {
     font-size: $gl-font-size;
   }