fix(popout): prevent duplicate audio track subscription (backport 2.9/26.2)

Maximilian Fußrequested to merge
m.fuss/web-app:3529-backport-popout-stream-prevent-duplicate-track-subscription-to-v-2-9-x-2 into release/v2.9.x

fix(popout): prevent duplicate audio track subscription

Closes #3529 (closed)

(cherry picked from commit 960a6695)

Closes #3529 (closed)

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