Add RC2 changes to 9-3-stable

Adds the changes from b1bf6d88 to 9-3-stable

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/33536

app/assets/javascripts/pipelines/components/graph/graph_component.vue

@@ -48,24 +48,6 @@
         return className;
       },
-
-      isFirstColumn(index) {
-        return index === 0;
-      },
-
-      stageConnectorClass(index, stage) {
-        let className;
-
-        // If it's the first stage column and only has one job
-        if (index === 0 && stage.groups.length === 1) {
-          className = 'no-margin';
-        } else if (index > 0) {
-          // If it is not the first column
-          className = 'left-margin';
-        }
-
-        return className;
-      },
     },
   };
 </script>