fix(popout): prevent duplicate audio track subscription (backport 2.10/26.3)

Maximilian Fußrequested to merge
m.fuss/web-app:3531-backport-popout-stream-prevent-duplicate-track-subscription-to-v-2-10-x into release/v2.10.x

fix(popout): prevent duplicate audio track subscription

Closes #3531 (closed)

(cherry picked from commit 960a6695)

Closes #3531 (closed)

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