remote ssh: Make "get permalink to line" work (#19366)

This makes the `editor: copy permalink to line` and `editor: copy
permalink to line` actions work in SSH remote projects.

Previously it would only work in local projects.

Demo:


https://github.com/user-attachments/assets/a8012152-b631-4b34-9ff2-e4d033c97dee




Release Notes:

- N/A

crates/proto/proto/zed.proto

@@ -292,7 +292,10 @@ message Envelope {
         Toast toast = 261;
         HideToast hide_toast = 262;
 
-        OpenServerSettings open_server_settings = 263; // current max
+        OpenServerSettings open_server_settings = 263;
+
+        GetPermalinkToLine get_permalink_to_line = 264;
+        GetPermalinkToLineResponse get_permalink_to_line_response = 265;  // current max
     }
 
     reserved 87 to 88;
@@ -2508,3 +2511,13 @@ message HideToast {
 message OpenServerSettings {
     uint64 project_id = 1;
 }
+
+message GetPermalinkToLine {
+    uint64 project_id = 1;
+    uint64 buffer_id = 2;
+    Range selection = 3;
+}
+
+message GetPermalinkToLineResponse {
+    string permalink = 1;
+}

crates/proto/src/proto.rs

@@ -370,6 +370,8 @@ messages!(
     (Toast, Background),
     (HideToast, Background),
     (OpenServerSettings, Foreground),
+    (GetPermalinkToLine, Foreground),
+    (GetPermalinkToLineResponse, Foreground),
 );
 
 request_messages!(
@@ -494,7 +496,8 @@ request_messages!(
     (CheckFileExists, CheckFileExistsResponse),
     (ShutdownRemoteServer, Ack),
     (RemoveWorktree, Ack),
-    (OpenServerSettings, OpenBufferResponse)
+    (OpenServerSettings, OpenBufferResponse),
+    (GetPermalinkToLine, GetPermalinkToLineResponse),
 );
 
 entity_messages!(
@@ -571,7 +574,7 @@ entity_messages!(
     Toast,
     HideToast,
     OpenServerSettings,
-
+    GetPermalinkToLine,
 );
 
 entity_messages!(