Set telecomCallId in Remote ConnectionRequest

Ensure that the telecom call id generated when creating a remote
connection or conference in RemoteConnectionService is saved into the
ConnectionRequest. This was causing the call id to show up as null in
Telephony.

Bug: 323358714
Test: atest RemoteConnectionTest
Change-Id: I6a65c81af302da5071c5f24f728cf4a94415836e