[MM-219] Fix issue of username not visible in jitsi embed meeting (#240) * [MM-219] Fix issue of username not visible in jitsi embed meeting * [MM-219] Add username field in the mock user data * [MM-219] Encode the meeting link * Fix typescript errors and snapshots * [MM-219]: Fixed review commentw * [MM-219]: Fixed review comments * [MM-219]: Fixed review comments --------- Co-authored-by: raghavaggarwal2308 <raghav.aggarwal@brightscout.com> Co-authored-by: kshitij <kshitij.katiyar@brightscout.com> Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>