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

blueprints/serverless/cloud-run-explore/README.md

@@ -223,5 +223,5 @@ module "test" {
   }
 }
 
-# tftest modules=4 resources=19
+# tftest modules=4 resources=22
 ```