When findOrCreateDmChannel creates or finds a local channel for a federatedId that has an active FederatedCallEntry with null dmChannelId, update the entry. Prevents stale null references for Path B calls.
When findOrCreateDmChannel creates or finds a local channel for a federatedId that has an active FederatedCallEntry with null dmChannelId, update the entry. Prevents stale null references for Path B calls.