feat(conversation-recorder): add webhook support and enhance storage handling

[Roei-Bracha]

Description

This PR introduces webhook support for upload notifications, fixes prefix path issues for GCS and S3 upload destinations, ensures local recordings are preserved if uploads fail, and resolves a critical race condition.

Important

Critical Bug Fix: Fixes a race condition during initialization. If start_recording was invoked before on_start() completed, the event loop (self.loop) remained uninitialized, leading to a failure that could crash/fail the entire conversation pipeline.

Changes

• conversation-recorder extension:
  • Race Condition Fix: Lazy-initialize the asyncio event loop in start_recording if it is not already set.
  • Add webhook configuration parameters in manifest.json.
  • Trigger webhook URL notification after successful upload in GCS or S3.
  • Correctly structure the object key prefix when uploading to GCS and S3 buckets.
  • Modify storage cleanup logic to preserve local file when upload raises an exception.
• tests:
  • Add comprehensive unit tests for storage upload failure recovery and prefix path handling.
  • Add unit tests for event loop lazy-initialization logic.
  • Fix PYTHONPATH in test start script to correctly resolve the extension package.