[MM-46579] Add a limit for preferences (#21780)

* add a limit for preferences

* add limits to preferences

* add config to telemetry

* remove unneeded tags from config

model/config.go

@@ -385,6 +385,7 @@ type ServiceSettings struct {
 	EnableCustomGroups                                *bool   `access:"site_users_and_teams"`
 	SelfHostedPurchase                                *bool   `access:"write_restrictable,cloud_restrictable"`
 	AllowSyncedDrafts                                 *bool   `access:"site_posts"`
+	ExperimentalMaxUserPreferences                    *int
 }
 
 func (s *ServiceSettings) SetDefaults(isUpdate bool) {
@@ -857,6 +858,10 @@ func (s *ServiceSettings) SetDefaults(isUpdate bool) {
 	if s.SelfHostedPurchase == nil {
 		s.SelfHostedPurchase = NewBool(true)
 	}
+
+	if s.ExperimentalMaxUserPreferences == nil {
+		s.ExperimentalMaxUserPreferences = NewInt(1000)
+	}
 }
 
 type ClusterSettings struct {