Add a workaround for the fact that MatrixChat attempts to use React state for the state of a state machine: a small `sleep` to let the state settle. As a result, it turns out we may not see the "Syncing..." state, and in general `waitForSyncAndLoad` doesn't seem to be doing anything useful.
Any UTs for vector-web layer components or functionality should go here. This used to contain the UTs for notifications before they got moved to react-sdk.