Mm 52993 - expose enable user statuses to client (#25455)

* MM-52993_expose enable user statuses to client and prevent statuses fetch when disabled

* modify the logic, add selector, add unit tests

* implement PR feedback

* fix unit tests

* remove client console warnings

* remove another unnecessary call if the flag is disabled

* fix merge conflicts

server/config/client_test.go

@@ -240,6 +240,19 @@ func TestGetClientConfig(t *testing.T) {
 				"ExperimentalSharedChannels": "true",
 			},
 		},
+		{
+			"disable EnableUserStatuses",
+			&model.Config{
+				ServiceSettings: model.ServiceSettings{
+					EnableUserStatuses: model.NewBool(false),
+				},
+			},
+			"",
+			nil,
+			map[string]string{
+				"EnableUserStatuses": "false",
+			},
+		},
 		{
 			"Shared channels enterprise license",
 			&model.Config{