[C++][FlightRPC] Implement shutdown with deadline for UCX

[asfimport]

The UCX server in ARROW-15706 does not implement shutdown with deadline.

Reporter: David Li / @lidavidm

Related issues:

• [C++][FlightRPC] Implement a UCX transport (is related to)

_{Note: This issue was originally created as ARROW-16125. Please see the migration documentation for further details.}