backport: fix(raise_hands): handling of raise_hands_disabled

Maximilian Fußrequested to merge
m.fuss/web-app:3461-backport-update-participants-state-on-raise_hands_disabled-event-to-v2-9-x into release/v2.9.x

fix(raise_hands): handling of raise_hands_disabled

reset hasHandUp state for all participants

Closes #3461 (closed)

(cherry picked from commit 4030aef5)

Closes #3461 (closed)

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