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/cloud-operations/dns-shared-vpc/README.md

@@ -51,5 +51,5 @@ module "test" {
   shared_vpc_link    = "https://www.googleapis.com/compute/v1/projects/test-dns/global/networks/default"
   teams              = ["team1", "team2"]
 }
-# tftest modules=9 resources=16
+# tftest modules=9 resources=22
 ```