fix: reaction errcheck issues (#28513)

server/.golangci.yml

@@ -89,7 +89,8 @@ issues:
         channels/api4/plugin.go|\
         channels/api4/plugin_test.go|\
         channels/api4/post_test.go|\
-        channels/api4/reaction.go|\
+        channels/api4/preference_test.go|\
+        channels/api4/reaction_test.go|\
         channels/api4/remote_cluster.go|\
         channels/api4/role.go|\
         channels/api4/role_test.go|\