ssh remoting: Undo the spawning of message handlers (#19409)

I suspect that this might have something to do with saving files not
being possible after a while.

I want to merge this and bump nightly.

Release Notes:

- N/A

crates/remote/src/ssh_session.rs

@@ -1526,7 +1526,6 @@ impl ChannelClient {
                             cx.clone(),
                         ) {
                             log::debug!("ssh message received. name:{type_name}");
-                            cx.foreground_executor().spawn(async move {
                             match future.await {
                                 Ok(_) => {
                                     log::debug!("ssh message handled. name:{type_name}");
@@ -1537,8 +1536,6 @@ impl ChannelClient {
                                     );
                                 }
                             }
-                            }).detach();
-
                         } else {
                             log::error!("unhandled ssh message name:{type_name}");
                         }