build: add action for test commands to cfn template

[huanjani]

These changes bring the test commands introduced in #1029 all the way through execution. If test commands are present in deploy.PipelineStage, CodeBuild actions are added to the specified deploy stage(s) of the CFN template and run accordingly. Addresses #783.

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[huanjani]

relevant part of a generated CFN template:

 - Name: DeployTo-test
          Actions:
            - Name: TestCommands
              ActionTypeId:
                Category: Test
                Owner: AWS
                Version: 1
                Provider: CodeBuild
              InputArtifacts:
                - Name: SCCheckoutArtifact
              Configuration:
                ProjectName: !Ref BuildTestCommands0
              RunOrder: 1
            - Name: CreateOrUpdate-svc1-test
              Region: us-west-2
              ActionTypeId:
                Category: Deploy
                Owner: AWS
                Version: 1
                Provider: CloudFormation
              Configuration:
                # https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/continuous-delivery-codepipeline-action-reference.html
                ChangeSetName: sample-test-svc1
                ActionMode: CREATE_UPDATE
                StackName: sample-test-svc1
                Capabilities: CAPABILITY_NAMED_IAM
                TemplatePath: BuildOutput::infrastructure/svc1.stack.yml
                TemplateConfiguration: BuildOutput::infrastructure/svc1-test.params.json
                # The ARN of the IAM role (in the env account) that
                # AWS CloudFormation assumes when it operates on resources
                # in a stack in an environment account.
                RoleArn: arn:aws:iam::327148513104:role/sample-test-CFNExecutionRole
              InputArtifacts:
                - Name: BuildOutput
              RunOrder: 2
              # The ARN of the environment manager IAM role (in the env
              # account) that performs the declared action. This is assumed
              # through the roleArn for the pipeline.
              RoleArn: arn:aws:iam::327148513104:role/sample-test-EnvManagerRole
        - Name: DeployTo-prod
          Actions:
            - Name: TestCommands
              ActionTypeId:
                Category: Test
                Owner: AWS
                Version: 1
                Provider: CodeBuild
              InputArtifacts:
                - Name: SCCheckoutArtifact
              Configuration:
                ProjectName: !Ref BuildTestCommands1
              RunOrder: 1

[bvtujo]

Looks really cool! Just a few questions!

[iamhopaul123]

Looks really good! Just a few questions

[efekarakus]

Awesome, this looks great!

[efekarakus]

🚀 woohoo