Make tree items more actionable and add AppAction for expanding the object tree (#5997)

* style: add `visibility` to tree expand triangles

- The purpose of this is so that Playwright can perform actionability checks on the tree items. This will make operations involving expanding tree items much easier to perform in e2e.

* feat(e2e): Add AppAction to expand the entire tree

* fix: wait for loading indicator

* test: add test for `expandEntireTree`

* test: update `expandEntireTree` and tree selectors

- Use dynamic aria-label for different tree implementations

- Get rid of CSS ids which are only for testing

- Update percy tree scope selector

* chore(lint): remove unused variable

* refactor(e2e): update tree locators

Co-authored-by: John Hill <john.c.hill@nasa.gov>

e2e/tests/framework/appActions.e2e.spec.js

@@ -21,7 +21,7 @@
  *****************************************************************************/
 
 const { test, expect } = require('../../pluginFixtures.js');
-const { createDomainObjectWithDefaults, createNotification } = require('../../appActions.js');
+const { createDomainObjectWithDefaults, createNotification, expandEntireTree } = require('../../appActions.js');
 
 test.describe('AppActions', () => {
     test('createDomainObjectsWithDefaults', async ({ page }) => {
@@ -109,4 +109,57 @@ test.describe('AppActions', () => {
         await expect(page.locator('.c-message-banner')).toHaveClass(/error/);
         await page.locator('[aria-label="Dismiss"]').click();
     });
+    test('expandEntireTree', async ({ page }) => {
+        await page.goto('./', { waitUntil: 'networkidle' });
+
+        const rootFolder = await createDomainObjectWithDefaults(page, {
+            type: 'Folder'
+        });
+        const folder1 = await createDomainObjectWithDefaults(page, {
+            type: 'Folder',
+            parent: rootFolder.uuid
+        });
+
+        await createDomainObjectWithDefaults(page, {
+            type: 'Clock',
+            parent: folder1.uuid
+        });
+        const folder2 = await createDomainObjectWithDefaults(page, {
+            type: 'Folder',
+            parent: folder1.uuid
+        });
+        await createDomainObjectWithDefaults(page, {
+            type: 'Folder',
+            parent: folder1.uuid
+        });
+        await createDomainObjectWithDefaults(page, {
+            type: 'Display Layout',
+            parent: folder2.uuid
+        });
+        await createDomainObjectWithDefaults(page, {
+            type: 'Folder',
+            parent: folder2.uuid
+        });
+
+        await page.goto('./#/browse/mine');
+        await expandEntireTree(page);
+        const treePane = page.getByRole('tree', {
+            name: "Main Tree"
+        });
+        const treePaneCollapsedItems = treePane.getByRole('treeitem', { expanded: false });
+        expect(await treePaneCollapsedItems.count()).toBe(0);
+
+        await page.goto('./#/browse/mine');
+        //Click the Create button
+        await page.click('button:has-text("Create")');
+
+        // Click the object specified by 'type'
+        await page.click(`li[role='menuitem']:text("Clock")`);
+        await expandEntireTree(page, "Create Modal Tree");
+        const locatorTree = page.getByRole("tree", {
+            name: "Create Modal Tree"
+        });
+        const locatorTreeCollapsedItems = locatorTree.locator('role=treeitem[expanded=false]');
+        expect(await locatorTreeCollapsedItems.count()).toBe(0);
+    });
 });