Outbound voice calls were being auto-assigned to the wrong agent. When
an agent placed an outbound call, the conversation was created without
an assignee, so inboxes with auto-assignment enabled would round-robin
it to a different agent instead of keeping it with the person who
actually made the call. This made it hard to tell which agent was on an
active call.
## What changed
- Set the calling agent as the conversation's assignee when creating an
outbound voice call conversation.
- This prevents the generic auto-assignment handler from treating the
conversation as unassigned and reassigning it.
- Added specs covering the assignment, including a regression case with
inbox auto-assignment enabled.
**Note:** this applies to newly placed calls; it does not retroactively
fix conversations that were already mis-assigned.
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Co-authored-by: Tanmay Deep Sharma <tanmaydeepsharma21@gmail.com>
Co-authored-by: Tanmay Deep Sharma <32020192+tds-1@users.noreply.github.com>
