✅(e2e) remove some flakiness

Service worker added some flakiness, we
activate the sw only if not from the CI.
We add as well the email of the user added in a
doc to the toast message. This way we can check
if the user was added correctly, this will remove
some flakiness in some tests.

src/frontend/apps/e2e/__tests__/app-impress/pad-create.spec.ts

@@ -95,6 +95,9 @@ test.describe('Pad Create', () => {
   });
 
   test('checks 404 on docs/[id] page', async ({ page }) => {
+    // eslint-disable-next-line playwright/no-wait-for-timeout
+    await page.waitForTimeout(300);
+
     await page.goto('/docs/some-unknown-pad');
     await expect(
       page.getByText(