fix(coffee-break): stop audio tracks on start

Maximilian Fußrequested to merge
m.fuss/web-app:3513-backport-coffee-break-fully-release-microphone-track-to-v2-9-x into release/v2.9.x

fix(coffee-break): stop audio tracks on start

Closes #3513 (closed)

(cherry picked from commit e77e10ea)

Closes #3513 (closed)

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