Fix up specs that depend on triggered_by.

app/assets/javascripts/vue_merge_request_widget/components/mr_widget_pipeline.js

@@ -38,7 +38,8 @@ export default {
       return this.mr.pipeline.triggered || [];
     },
     triggeredBy() {
-      return this.mr.pipeline.triggered_by || [];
+      const response = this.mr.pipeline.triggered_by;
+      return response ? [response] : [];
     },
   },
   template: `

spec/javascripts/vue_shared/components/linked_pipelines_mini_list_spec.js

@@ -9,7 +9,7 @@ describe('Linked pipeline mini list', () => {
     beforeEach(() => {
       this.component = new ListComponent({
         propsData: {
-          triggered_by: mockData.triggered_by,
+          triggeredBy: [mockData.triggered_by],
         },
       }).$mount();
     });