Step 4 fails with The argument "impersonate_service_account" is required

[daniel-cit]

Expected Behavior

Deploy with Cloud Build of step 4 is successful.

Actual Behavior

Deploy with Cloud Build of step 4 fails with error:

Step #1 - "tf plan validate all": *************** TERRAFORM PLAN *******************
Step #1 - "tf plan validate all":       At environment: business_unit_1/shared 
Step #1 - "tf plan validate all": **************************************************
Step #1 - "tf plan validate all": 
Step #1 - "tf plan validate all": Error: Missing required argument
Step #1 - "tf plan validate all": 
Step #1 - "tf plan validate all":   on infra_pipeline.tf line 44, in module "infra_pipelines":
Step #1 - "tf plan validate all":   44: module "infra_pipelines" {
Step #1 - "tf plan validate all": 
Step #1 - "tf plan validate all": The argument "impersonate_service_account" is required, but no definition was
Step #1 - "tf plan validate all": found.
Step #1 - "tf plan validate all": 

Error is caused by change in module

github.com/terraform-google-modules/terraform-example-foundation/4-projects/modules/infra_pipelines

That now requires a service account to impersonate when running the gcloud builds submit command.

Steps to Reproduce the Problem

1. Follow the step inhttps://github.com/GoogleCloudPlatform/terraform-example-foundation-app/blob/main/foundation-extension/4-projects/README.md

Specifications

• Version: 3f2d916570ef287cb2dc28efe7cde4b93a82fe6b from https://github.com/GoogleCloudPlatform/terraform-example-foundation-app/pull/36
• Platform: Cloud build