Change all toast rejection code to use the rejectToast utility (#33025)

apps/web/playwright/e2e/sliding-sync/sliding-sync.spec.ts

@@ -7,6 +7,7 @@ Please see LICENSE files in the repository root for full details.
 */
 
 import { type Locator, type Page, type Request } from "@playwright/test";
+import { rejectToast } from "@element-hq/element-web-playwright-common";
 
 import { test as base, expect } from "../../element-web-test";
 import type { ElementAppPage } from "../../pages/ElementAppPage";
@@ -71,9 +72,9 @@ test.describe("Sliding Sync", () => {
     });
 
     // Load the user fixture for all tests
-    test.beforeEach(async ({ app, user }) => {
-        await app.closeVerifyToast();
-        await app.closeNotificationToast();
+    test.beforeEach(async ({ app, page, user }) => {
+        await rejectToast(page, "Verify this device");
+        await rejectToast(page, "Notifications");
     });
 
     test("should render the Rooms list in reverse chronological order by default and allowing sorting A-Z", async ({