Adding AWS::NoValue support to AWS::Serverless::Function IAM Role

[madsid]

Issue #, if available

#3736

Description of changes

Support AWS::NoValue conditional for Role property in AWS::Serverless::Function

Role is an optional string value for AWS::Serverless::Function. An execution role is auto generated code when the value is None. This change adds support for AWS::NoValue.

Use cases :

1. Role string passed though as is.
2. Role If conditional with both AWS::NoValue creates an execution role for both true and false case and replaces AWS::NoValue
3. Role if conditional with 1 AWS::NoValue creates an execution role and replaces AWS::NoValue
4. Role value with Fn::GetAtt gets passed through as is.

Description of how you validated changes

• Added unit tests
• Hand tested sam-translate.py with templates and verified translated templates

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.