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-local/e2e/blocksuite/list.spec.ts

@@ -48,7 +48,7 @@ test.describe('split list', () => {
       listLocator.nth(2).locator('.affine-list-block__numbered')
     ).toHaveText('2.');
     await expect(listLocator.nth(3).locator('rich-text')).toHaveText('ddd');
-    expect(
+    await expect(
       listLocator.nth(3).locator('.affine-list-block__numbered')
     ).toHaveText('3.');
 

tests/affine-local/e2e/local-first-workspace-list.spec.ts

@@ -137,15 +137,14 @@ test.skip('create multi workspace in the workspace list', async ({
     await expect(workspaceCards).toHaveCount(3);
   }
 
-  const workspaceChangePromise = page.evaluate(() => {
-    new Promise(resolve => {
+  await page.getByTestId('draggable-item').nth(2).click();
+  await page.evaluate(async () => {
+    await new Promise(resolve => {
       window.addEventListener('affine:workspace:change', resolve, {
         once: true,
       });
     });
   });
-  await page.getByTestId('draggable-item').nth(2).click();
-  await workspaceChangePromise;
 
   const nextWorkspace = await workspace.current();