[MM-25657] api4/config: add config migrate endpoint (#14928)

* api4/config: add config migrate endpoint

* api4/config: reflect review comments

* fix i18n lint error

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

api4/config_local.go

@@ -17,6 +17,7 @@ func (api *API) InitConfigLocal() {
 	api.BaseRoutes.ApiRoot.Handle("/config", api.ApiLocal(getConfig)).Methods("GET")
 	api.BaseRoutes.ApiRoot.Handle("/config", api.ApiLocal(localUpdateConfig)).Methods("PUT")
 	api.BaseRoutes.ApiRoot.Handle("/config/patch", api.ApiLocal(localPatchConfig)).Methods("PUT")
+	api.BaseRoutes.ApiRoot.Handle("/config/migrate", api.ApiLocal(migrateConfig)).Methods("POST")
 }
 
 func localUpdateConfig(c *Context, w http.ResponseWriter, r *http.Request) {