Allow sending `start_time` with default values

[ChrisGe4]

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Description

Allow sending start_time with default values. start_time 00:00 represents the policy will start at midnight.

New or Affected Resource(s)

• google_clouddeploy_deploy_policy

Potential Terraform Configuration

resource "google_clouddeploy_deploy_policy" "deploy_policy" {
  name     = "tf-test-cd-policy%{random_suffix}"
  location = "us-central1"
  selectors {
    delivery_pipeline {
      id = "tf-test-cd-pipeline%{random_suffix}"
    }
  }
  rules {
    rollout_restriction {
      id = "rule"
      time_windows {
        time_zone = "America/Los_Angeles"
        weekly_windows {
            start_time {
            hours = 0
            minutes = 0
           }
          end_time {
            hours = "24"
            minutes = "00"
          }
        }
      }
    }
  }
}

References

b/411422060