MM-25073/MM-25074: local mode for getGroupsByChannel and getGroupsByTeam (#14668)

* local mode for getGroupsByChannel

* local mode for getGroupsByTeam

api4/group_local.go

@@ -0,0 +1,9 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+func (api *API) InitGroupLocal() {
+	api.BaseRoutes.Channels.Handle("/{channel_id:[A-Za-z0-9]+}/groups", api.ApiLocal(getGroupsByChannel)).Methods("GET")
+	api.BaseRoutes.Teams.Handle("/{team_id:[A-Za-z0-9]+}/groups", api.ApiLocal(getGroupsByTeam)).Methods("GET")
+}