test(graphql-transformers-e2e-tests): prevent SES ratelimit errors

Without this commit, running e2e tests could cause this error: `Failed when signing up user
LimitExceededException: Exceeded daily email limit for the operation or the account. If a higher
limit is required, please configure your user pool to use your own Amazon SES configuration for
sending email.`

packages/graphql-transformers-e2e-tests/src/cognitoUtils.ts

@@ -51,6 +51,8 @@ export async function signupUser(userPoolId: string, name: string, pw: string) {
         UserAttributes: [{ Name: 'email', Value: name }],
         Username: name,
         TemporaryPassword: pw,
+        DesiredDeliveryMediums: [],
+        MessageAction: 'SUPPRESS',
       },
       (err, data) => (err ? rej(err) : res(data)),
     );