Restructure remote client crate, consolidate SSH logic (#36967)

This is a pure refactor that consolidates all SSH remoting logic such
that it should be straightforward to add another transport to the
remoting system.

Release Notes:

- N/A

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/vim/src/command.rs

@@ -1924,7 +1924,9 @@ impl ShellExec {
 
         let Some(range) = input_range else { return };
 
-        let mut process = project.read(cx).exec_in_shell(command, cx);
+        let Some(mut process) = project.read(cx).exec_in_shell(command, cx).log_err() else {
+            return;
+        };
         process.stdout(Stdio::piped());
         process.stderr(Stdio::piped());