Clean up handling of serialized ssh connection ids (#36781)

Small follow-up to #36714

Release Notes:

- N/A

crates/remote/src/ssh_session.rs

@@ -52,11 +52,6 @@ use util::{
     paths::{PathStyle, RemotePathBuf},
 };
 
-#[derive(
-    Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, serde::Serialize, serde::Deserialize,
-)]
-pub struct SshProjectId(pub u64);
-
 #[derive(Clone)]
 pub struct SshSocket {
     connection_options: SshConnectionOptions,