Fix audio dropping issues in Jetpack Telecom integration

[yrezgui]

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Description

• Replaced setActive() with answer(callType) for incoming calls in TelecomCallController's Activate command block, as Jetpack Telecom requires incoming calls to be explicitly answered.
• Enforced waiting for a successful CallControlResult.Success before dispatching AudioManagerCommand.Start to the ActiveCallManager, ensuring that the WebRTC audio engine does not begin recording or playing before Telecom has actually initialized the active media route.