Increase max length of export output

## 1. AWS::EKS::Cluster - CertificateAuthorityData

## 2. Scope of request
CertificateAuthorityData in EKS type is greater than ~1300 characters. The max length of output exports is 1024. This makes it not possible to export that output. It would be helpful to increase the max export length.

Sample Error:
Cannot export output CertificateAuthorityData with length 1368. Max length of 1024 exceeded.. Rollback requested by user.

## 3. Expected behavior
Create EKS cluster via cloudformation and be able to export CertificateAuthorityData.

## 6. Category (required) - Will help with tagging and be easier to find by other users to +1

Use the categories as displayed in the AWS Management Console (simplified):

1. Compute (EC2, ECS, EKS, Lambda...)