fix(popout): prevent duplicate audio track subscription (backport 2.8/26.1)

Maximilian Fußrequested to merge
m.fuss/web-app:3530-backport-popout-stream-prevent-duplicate-track-subscription-to-v-2-8-x into release/v2.8.x

fix(popout): prevent duplicate audio track subscription

Closes #3530 (closed)

(cherry picked from commit 960a6695)

Closes #3530 (closed)

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