Remove legacy signaling and legacy SS mode. (#12499)
* fix(connection-status): remove unused participant connectionStatus.
Always use trackStreamingStatus now that legacy endpoint based signaling has been removed.
* remove the check for source-name signaling.
Default to source-name signaling always.
* Remove the check for multi-stream mode.
Make that the default mode and remove the support for legacy SS mode.
* Remove presenter mode.
* update latest@lib-jitsi-meet
fix(external-api) Remove muted SS tracks from the list of participants currently screensharing.
Fixes an issue where 'contentSharingParticipantsChanged' event and 'getContentSharingParticipants' API continue to list IDs of the participants that have already stopped their screenshares.