fix(timer): clear timer state when switching breakout rooms

Albrecht Weicherequested to merge
a.weiche/web-app:3500-timer-not-cleared-when-switching-breakout-rooms into main

fix(timer): clear timer state when switching breakout rooms

Closes #3500 (closed)

Closes #3501 (closed)

depends on https://git.opentalk.dev/opentalk/backend/services/roomserver/-/merge_requests/1298

Edited by Albrecht Weiche

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