[Notebook] Dropping item into "drop area" in notebook not working (#5791)

* notebook embed visual test initial

* waiting for createNewEmbed util function to finish before adding embed

* removing debug code

* adding unstable tag to visual test

* added e2e embed tests for existing and new entriesupdated some test utils as well

* removing test artifacts

* removing more test artifacts

* adding test data back in

* removing debug code

* adding back in test artifacts

* updated test I broke

* removing focused test

* removing unsed variable

* fix lint issues

* adding unstable tag for new e2e tests

e2e/appActions.js

@@ -102,6 +102,17 @@ async function createDomainObjectWithDefaults(page, { type, name, parent = 'mine
     };
 }
 
+/**
+ * @param {import('@playwright/test').Page} page
+ * @param {string} name
+ */
+async function expandTreePaneItemByName(page, name) {
+    const treePane = page.locator('#tree-pane');
+    const treeItem = treePane.locator(`role=treeitem[expanded=false][name=/${name}/]`);
+    const expandTriangle = treeItem.locator('.c-disclosure-triangle');
+    await expandTriangle.click();
+}
+
 /**
  * Create a Plan object from JSON with the provided options.
  * @param {import('@playwright/test').Page} page
@@ -313,6 +324,7 @@ async function setEndOffset(page, offset) {
 // eslint-disable-next-line no-undef
 module.exports = {
     createDomainObjectWithDefaults,
+    expandTreePaneItemByName,
     createPlanFromJSON,
     openObjectTreeContextMenu,
     getHashUrlToDomainObject,