test(core): enable no-floating-promises rule for tests (#11915)

Sometimes, missing `await` in the test code can cause timing issues, leading to test failures. This PR enables the `no-floating-promises` rule for the test code to ensure that such errors do not occur.

tests/affine-cloud/e2e/template.spec.ts

@@ -28,6 +28,6 @@ test('import from template should work', async ({ page }) => {
   const btn = page.getByTestId('import-template-to-workspace-btn');
 
   await btn.isVisible();
-  btn.click();
+  await btn.click();
   await waitForEditorLoad(page);
 });