Make cycle analytics specs compatible w/ BototstrapVue 2

ee/spec/frontend/analytics/cycle_analytics/components/stage_event_list_spec.js

@@ -33,6 +33,8 @@ const mockStubs = {
 function createComponent({ props = {}, shallow = false, Component = StageEventList, stubs }) {
   const func = shallow ? shallowMount : mount;
   return func(Component, {
+    attachToDocument: true,
+    sync: false,
     propsData: {
       stage: issueStage,
       events: issueEvents,

ee/spec/frontend/analytics/cycle_analytics/components/stage_table_spec.js

@@ -47,6 +47,7 @@ function createComponent(props = {}, shallow = false) {
       'gl-loading-icon': true,
     },
     sync: false,
+    attachToDocument: true,
   });
 }