Refactor service agent management (#2423)

* Service agents script

* Service agents update

* WIP

* Update script and terraform

* Fix tests

* Fix linter

* Update docs

* Bring back pf example inventory

* Fix tests

* Fix more tests

* Fix tests

* Use dataclasses for build_service_agents.py

* Remove unneeded field() from build_service_agents

* Re-enable CMEK depends_on in project outputs

* Update tools/requirements.txt

* Enable storage in GCS example projects

* Fix tests

* Add CMEK Service Agents dependencies for services

* Fix typos and data platform cmek

* More typos

modules/cloud-run-v2/README.md

@@ -181,7 +181,7 @@ module "cloud_run" {
     }
   }
 }
-# tftest modules=4 resources=40 fixtures=fixtures/shared-vpc.tf inventory=service-vpc-access-connector-create-sharedvpc.yaml e2e
+# tftest modules=4 resources=55 fixtures=fixtures/shared-vpc.tf inventory=service-vpc-access-connector-create-sharedvpc.yaml e2e
 ```
 
 ## Using Customer-Managed Encryption Key