minor: remove stub e2e test

Author: david-crespo

test/e2e/instance.e2e.ts

@@ -240,7 +240,3 @@ test('instance table', async ({ page }) => {
     state: expect.stringMatching(/^starting\d+s$/),
   })
 })
-
-test("polling doesn't close row actions menu", async ({ page }) => {
-  await page.goto('/projects/mock-project/instances/db1')
-})