IAM: Add teams/{id}/groups as a custom endpoint to Teams API (#114228)

* Add teams/{id}/groups as a custom endpoint

* TeamGroupsHandler OSS and Ent registration

* Update OpenAPI spec

* Add indexer tests for external group mapping

* Remove noopsearch

* Remove unnecessary interface declaration, fixes

* Chores

* fmt

* Rename constant

* Align the rest to the changes of main

* Update workspace

* Add missing file

pkg/registry/apis/iam/externalgroupmapping/models.go

@@ -0,0 +1,10 @@
+package externalgroupmapping
+
+import "k8s.io/apiserver/pkg/registry/rest"
+
+type TeamGroupsHandler interface {
+	rest.Storage
+	rest.Scoper
+	rest.StorageMetadata
+	rest.Connecter
+}