fix: support KmsKeyArn in Serverless::CapacityProvider

[valerena]

Issue #, if available

AWS::Serverless::CapacityProvider doesn't support correctly the field KmsKeyArn.

Description of changes

• Replace the wrong version of this that was added in the past, that tried to use KMSKeyArn instead of KmsKeyArn.

I also changed a few other minor things on the tests template, so they were correct according to cfn-lint. Capacity Providers are not available in other partitions, so we continue ignoring the test JSON files in those other partitions.

Description of how you validated changes

• make pr
• I did a local transform and then deployed successfully (actual values modified, but this template).

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Full CapacityProvider configuration test

Resources:
  CapacityProvider:
    Type: AWS::Serverless::CapacityProvider
    Properties:
      CapacityProviderName: customized-capacity-provider
      VpcConfig:
        SecurityGroupIds:
        - sg-32a88741
        SubnetIds:
        - subnet-954883c1
      KmsKeyArn: arn:aws:kms:us-east-1:123456789012:key/9b2d4ac3-883a-67a9-b5e2-1bf3e6add71a

Checklist

• Review the generative AI contribution guidelines
• Adheres to the development guidelines
• Add/update transform tests
  • Using correct values
  • Using wrong values
• Add/update integration tests

Examples?

Please reach out in the comments if you want to add an example. Examples will be
added to sam init through aws/aws-sam-cli-app-templates.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.