Merge branch 'ee-10092-stage-column' into 'master'

EE: Removes EE differences for stage column

See merge request gitlab-org/gitlab-ee!10004

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

 <script>
 import _ from 'underscore';
+import stageColumnMixin from 'ee_else_ce/pipelines/mixins/stage_column_mixin';
 import JobItem from './job_item.vue';
 import JobGroupDropdown from './job_group_dropdown.vue';
 
@@ -8,6 +9,7 @@ export default {
     JobItem,
     JobGroupDropdown,
   },
+  mixins: [stageColumnMixin],
   props: {
     title: {
       type: String,
@@ -27,19 +29,11 @@ export default {
       required: false,
       default: '',
     },
-    hasTriggeredBy: {
-      type: Boolean,
-      required: false,
-      default: false,
-    },
   },
   methods: {
     groupId(group) {
       return `ci-badge-${_.escape(group.name)}`;
     },
-    buildConnnectorClass(index) {
-      return index === 0 && (!this.isFirstColumn || this.hasTriggeredBy) ? 'left-connector' : '';
-    },
     pipelineActionRequestComplete() {
       this.$emit('refreshPipelineGraph');
     },

app/assets/javascripts/pipelines/mixins/stage_column_mixin.js

+export default {
+  methods: {
+    buildConnnectorClass(index) {
+      return index === 0 && !this.isFirstColumn ? 'left-connector' : '';
+    },
+  },
+};

ee/app/assets/javascripts/pipelines/mixins/stage_column_mixin.js

+export default {
+  props: {
+    hasTriggeredBy: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+  methods: {
+    buildConnnectorClass(index) {
+      return index === 0 && (!this.isFirstColumn || this.hasTriggeredBy) ? 'left-connector' : '';
+    },
+  },
+};