Merge branch 'ph/fixPerfBarAndFileHeaders' into 'master'

Fix gap above file titles on overview tab

See merge request gitlab-org/gitlab!61604

app/assets/stylesheets/pages/notes.scss

@@ -372,7 +372,7 @@ $system-note-svg-size: 16px;
       top: $mr-tabs-height + $header-height;
 
       .with-performance-bar & {
-        top: 126px;
+        top: 123px;
       }
     }