review our proto validate implementation

[strantalis]

We should take a look at our protos and see where we can add more validation.

Example is requiring an entity type in the following oneOf

platform/service/authorization/authorization.proto

Lines 20 to 28 in 8193cec

	oneof entity_type {
	string email_address = 2;
	string user_name = 3;
	string remote_claims_url = 4;
	string uuid = 5;
	google.protobuf.Any claims = 6;
	EntityCustom custom = 7;
	string client_id = 8;
	}

https://github.com/bufbuild/protoc-gen-validate/tree/main?tab=readme-ov-file#oneofs

[strantalis]

Will help protect us from this issue #1055

[jrschumacher]

@strantalis could we have the acceptance criteria be identifying the areas in need of improvement?