stabilize flaky embeddables/adding_children take 2 (#68873)

* wait for loading indicator to be deleted

* improve with retry

* Update test/examples/embeddables/adding_children.ts

Co-authored-by: Spencer <email@spalger.com>

Co-authored-by: Spencer <email@spalger.com>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

test/examples/embeddables/adding_children.ts

@@ -24,6 +24,7 @@ import { PluginFunctionalProviderContext } from 'test/plugin_functional/services
 export default function ({ getService }: PluginFunctionalProviderContext) {
   const testSubjects = getService('testSubjects');
   const flyout = getService('flyout');
+  const retry = getService('retry');
 
   describe('creating and adding children', () => {
     before(async () => {
@@ -33,8 +34,15 @@ export default function ({ getService }: PluginFunctionalProviderContext) {
     it('Can create a new child', async () => {
       await testSubjects.click('embeddablePanelToggleMenuIcon');
       await testSubjects.click('embeddablePanelAction-ACTION_ADD_PANEL');
-      await testSubjects.click('createNew');
+
+      // this seem like an overkill, but clicking this button which opens context menu was flaky
+      await testSubjects.waitForEnabled('createNew');
+      await retry.waitFor('createNew popover opened', async () => {
+        await testSubjects.click('createNew');
+        return await testSubjects.exists('createNew-TODO_EMBEDDABLE');
+      });
       await testSubjects.click('createNew-TODO_EMBEDDABLE');
+
       await testSubjects.setValue('taskInputField', 'new task');
       await testSubjects.click('createTodoEmbeddable');
       const tasks = await testSubjects.getVisibleTextAll('todoEmbeddableTask');
@@ -44,6 +52,7 @@ export default function ({ getService }: PluginFunctionalProviderContext) {
     it('Can add a child backed off a saved object', async () => {
       await testSubjects.click('embeddablePanelToggleMenuIcon');
       await testSubjects.click('embeddablePanelAction-ACTION_ADD_PANEL');
+      await testSubjects.waitForDeleted('savedObjectFinderLoadingIndicator');
       await testSubjects.click('savedObjectTitleGarbage');
       await testSubjects.moveMouseTo('euiFlyoutCloseButton');
       await flyout.ensureClosed('dashboardAddPanel');