SSH remote ui (#15129)

Still TODO:
* [x] hide this UI unless you have some ssh projects in settings
* [x] add the "open folder" flow with the new open picker
* [ ] integrate with recent projects / workspace restoration

Release Notes:

- N/A

crates/remote/src/remote.rs

@@ -2,4 +2,4 @@ pub mod json_log;
 pub mod protocol;
 pub mod ssh_session;
 
-pub use ssh_session::{SshClientDelegate, SshPlatform, SshSession};
+pub use ssh_session::{SshClientDelegate, SshConnectionOptions, SshPlatform, SshSession};