PHP before version 8.1 automatically converted to int if the function
parameter (or array key) is expected to be int. PHP 8.1 shows notice in
this case
* BBB has specific completion indicator that need to be taken into account
* Fix mock requests so we can send participant id and then attach events to them
* Refactor slightly the broker to split meeting logic from request (decoding)
* Fix update completion state cron
* Completion view should work out of the box
* Patch the _user_outline and _user_complete so it works with completion view, while
implementing something better in MDL-74468
Marina Glancy