amqp_channel: Ignore all exceptions from `rabbit_writer:flush/1`

[Why]
The writer process could still be exiting at the time flush is called.
For instance, the reason could be `{shutdown, _}`.

Also, with the conversion of the `rabbit_writer` to a gen_server, the
noproc reason would be `{noproc, _}`.

[How]
`flush_writer/1` is called in the channel `terminate/2` function, so we
don't really care about any writer errors at this point. Let's ignore
any exceptions.

deps/amqp_client/src/amqp_channel.erl

@@ -876,11 +876,8 @@ do(Method, Content, Flow, #state{driver = direct, writer = W}) ->
 
 
 flush_writer(#state{driver = network, writer = Writer}) ->
-    try
-        rabbit_writer:flush(Writer)
-    catch
-        exit:noproc -> ok
-    end;
+    _ = catch rabbit_writer:flush(Writer),
+    ok;
 flush_writer(#state{driver = direct}) ->
     ok.
 amqp_msg(none) ->