feat(ui): adds admin.components.listMenuItems option (#11230)

### What?
Adds new option `admin.components.listMenuItems` to allow custom
components to be injected after the existing list controls in the
collection list view.

### Why?
Needed to facilitate import/export plugin.

#### Testing

Use `pnpm dev admin` to see example component and see test added to
`test/admin/e2e/list-view`.


## Update since feature was reverted
The custom list controls and now rendered with no surrounding padding or
border radius.

<img width="596" alt="Screenshot 2025-02-17 at 5 06 44 PM"
src="https://github.com/user-attachments/assets/57209367-5433-4a4c-8797-0f9671da15c8"
/>

---------

Co-authored-by: Dan Ribbens <dan.ribbens@gmail.com>

test/admin/collections/Posts.ts

@@ -33,6 +33,26 @@ export const Posts: CollectionConfig = {
           },
         },
       ],
+      listMenuItems: [
+        {
+          path: '/components/Banner/index.js#Banner',
+          clientProps: {
+            message: 'listMenuItems',
+          },
+        },
+        {
+          path: '/components/Banner/index.js#Banner',
+          clientProps: {
+            message: 'Many of them',
+          },
+        },
+        {
+          path: '/components/Banner/index.js#Banner',
+          clientProps: {
+            message: 'Ok last one',
+          },
+        },
+      ],
       afterList: [
         {
           path: '/components/Banner/index.js#Banner',

test/admin/e2e/list-view/e2e.spec.ts

@@ -198,6 +198,19 @@ describe('List View', () => {
       ).toBeVisible()
     })
 
+    test('should render custom listMenuItems component', async () => {
+      await page.goto(postsUrl.list)
+      const kebabMenu = page.locator('.list-controls__popup')
+      await expect(kebabMenu).toBeVisible()
+      await kebabMenu.click()
+
+      await expect(
+        page.locator('.popup-button-list').locator('div', {
+          hasText: 'listMenuItems',
+        }),
+      ).toBeVisible()
+    })
+
     test('should render custom afterListTable component', async () => {
       await page.goto(postsUrl.list)
       await expect(