* restores react18 createRoot
* fix slideChange issue - new slide not loading
* fix skip video preview
* test: update screenshare function checks + close notifications
---------
Co-authored-by: Anton B <antonbsa.bck@gmail.com>
the default presentation notification on the moderator page.
Waiting until initPages() is finished to do this is problematic, because
it might take long enough to init the user page that the toast has
disappeared from the moderator page by the time initPages() finishes.
Change all the places in the test suite where initPages() is called
right before waitAndClearDefaultPresentationNotification to use
the new option instead.
In one place (raiseAndLowerHand) I also dropped waiting and clearing
the notification on the user page because it was causing problems
and doesn't seem to be necessary.
