At the moment we can't test properly SyncConfiguration.cancelWaitsOnNonFatalError until:

• https://github.com/realm/realm-core/issues/6301 is fixed. At the moment core rejects all the "non sensible" timeouts, and we need to set a very low one to simulate reliably a connection issue
• We expose SyncClientConfig.timeouts(realm/realm-core@e83515f/src/realm/object-store/sync/sync_manager.hpp#L97) so that we can set the timeouts properly. This was not exposed on JS so I've not added this for now

So far this parameter was only tested manually setting a connect_timeout of 1ms in core (realm/realm-core@e83515f/src/realm/object-store/sync/impl/sync_client.hpp#L54).

Later we need to revisit this when the corresponding ticket have been fixed.