⚡ Bolt: Remove redundant participant list call

[Adityasingh-8858]

💡 What: Removed the list_participants check in remove_participant_from_room prior to calling remove_participant directly.
🎯 Why: LiveKit gracefully handles and throws an exception when attempting to remove a non-existent participant. Listing participants first to verify their existence incurred an unnecessary network round-trip, increasing latency on transfers.
📊 Impact: Eliminates one API call / network round-trip from the critical path of the transfer completion flow, shaving off valuable milliseconds.
🔬 Measurement: Verify tests run. Monitor network traces on transfer to confirm 1 less API request to the LiveKit server is made.

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PR created automatically by Jules for task 10001106491784329290 started by @Deepaksingh7238

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