✅(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-member-delete.spec.ts

@@ -153,12 +153,6 @@ test.describe('Members Delete', () => {
 
     const username = await addNewMember(page, 1, 'Admin');
 
-    await expect(
-      page.getByText(`User added to the document.`).last(),
-    ).toBeHidden({
-      timeout: 5000,
-    });
-
     await page.getByLabel('Open the document options').click();
     await page.getByRole('button', { name: 'Manage members' }).click();