chore: update integ tests

Update integ tests to change expected state from continueSignInWithTotpSetup to continueSignInWithMfaSetupSelection

Author: khatruong2009

packages/auth/amplify_auth_cognito/example/integration_test/mfa_sms_totp_required_test.dart

@@ -35,7 +35,7 @@ void main() {
           signInRes.nextStep.signInStep,
           because: 'MFA is required, and TOTP is chosen when '
               'no phone number is registered',
-        ).equals(AuthSignInStep.continueSignInWithTotpSetup);
+        ).equals(AuthSignInStep.continueSignInWithMfaSetupSelection);
 
         final sharedSecret = signInRes.nextStep.totpSetupDetails!.sharedSecret;
         final setupRes = await Amplify.Auth.confirmSignIn(

packages/auth/amplify_auth_cognito/example/integration_test/mfa_totp_required_test.dart

@@ -34,7 +34,7 @@ void main() {
           signInRes.nextStep.signInStep,
           because:
               "TOTP MFA is automatically enabled when it's the only option",
-        ).equals(AuthSignInStep.continueSignInWithTotpSetup);
+        ).equals(AuthSignInStep.continueSignInWithMfaSetupSelection);
 
         final sharedSecret = signInRes.nextStep.totpSetupDetails!.sharedSecret;
         final setupRes = await Amplify.Auth.confirmSignIn(