feat(auth): add MFA handling in team invitations flow (#285)

- Export `MultiFactorAuthError` from `require-user` for reuse.
- Implement MFA handling during team invitations' sign-in flow.
- Add E2E test for team invitation flow with MFA.
- Update components to improve i18n translation handling.

packages/supabase/src/require-user.ts

@@ -62,7 +62,7 @@ class AuthenticationError extends Error {
   }
 }
 
-class MultiFactorAuthError extends Error {
+export class MultiFactorAuthError extends Error {
   constructor() {
     super(`Multi-factor authentication required`);
   }