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/editor/src/editor.rs

@@ -20074,7 +20074,7 @@ impl Editor {
                 let (telemetry, is_via_ssh) = {
                     let project = project.read(cx);
                     let telemetry = project.client().telemetry().clone();
-                    let is_via_ssh = project.is_via_ssh();
+                    let is_via_ssh = project.is_via_remote_server();
                     (telemetry, is_via_ssh)
                 };
                 refresh_linked_ranges(self, window, cx);
@@ -20642,7 +20642,7 @@ impl Editor {
                 copilot_enabled,
                 copilot_enabled_for_language,
                 edit_predictions_provider,
-                is_via_ssh = project.is_via_ssh(),
+                is_via_ssh = project.is_via_remote_server(),
             );
         } else {
             telemetry::event!(
@@ -20652,7 +20652,7 @@ impl Editor {
                 copilot_enabled,
                 copilot_enabled_for_language,
                 edit_predictions_provider,
-                is_via_ssh = project.is_via_ssh(),
+                is_via_ssh = project.is_via_remote_server(),
             );
         };
     }