Allow AFT Create Pipeline to use TF Cloud / TF Enterprise backend

[wellsiau-aws]

Describe the outcome you'd like

Customer that use TFC or TFE as their Terraform backend expects that all resources provision by AFT to be managed in the same backend (TFC/TFE), including the account-specific CodePipeline

Is your feature request related to a problem you are currently experiencing? If so, please describe.

When AFT provision a new account, it creates account-specific CodePipeline that will manage the global and account level customization.

AFT uses this buildspec to create the pipeline. This buildspec however did not honor the choice of TFE/TFC as the backend and will always default to use S3 backend.

Additional context

For comparison, other buildspec such as aft-account-request did honor the choice of backend.

[snebhu3]

@wellsiau-aws thank you for reporting this. I have created a backlog to address your request.