fix: enforce 2FA for email password SSO linked accounts (#1072)

## Description

Fixed issue where accounts that were initially created via
email/password, then linked to an SSO account, can bypass the 2FA during
login if they use their email password.

## Testing Performed

Tested locally, and 2FA is now required for linked SSO accounts

packages/app-tests/e2e/test-auth-flow.spec.ts

@@ -30,7 +30,7 @@ test('user can sign up with email and password', async ({ page }: { page: Page }
   }
 
   await page.getByRole('button', { name: 'Next', exact: true }).click();
-  await page.getByLabel('Public profile username').fill('username-123');
+  await page.getByLabel('Public profile username').fill(Date.now().toString());
 
   await page.getByRole('button', { name: 'Complete', exact: true }).click();