API client generation: Create new IAM api client and use in query library (#99888)

* create new generated iam api client and use in query library

* update betterer

* use new createBaseQuery method

* update CODEOWNERS

* fix unit tests

* use shared type

* update comment

* fix test

pkg/tests/apis/openapi_test.go

@@ -67,6 +67,9 @@ func TestIntegrationOpenAPIs(t *testing.T) {
 	}, {
 		Group:   "peakq.grafana.app",
 		Version: "v0alpha1",
+	}, {
+		Group:   "iam.grafana.app",
+		Version: "v0alpha1",
 	}}
 	for _, gv := range groups {
 		VerifyOpenAPISnapshots(t, dir, gv, h)