proto: Remove unused UpdateUserSettings message (#20005)

Release Notes:

- N/A

crates/proto/proto/zed.proto

@@ -257,7 +257,6 @@ message Envelope {
         FindSearchCandidatesResponse find_search_candidates_response = 244;
 
         CloseBuffer close_buffer = 245;
-        UpdateUserSettings update_user_settings = 246;
 
         ShutdownRemoteServer shutdown_remote_server = 257;
 
@@ -309,6 +308,7 @@ message Envelope {
     reserved 205 to 206;
     reserved 221;
     reserved 224 to 229;
+    reserved 246;
     reserved 247 to 254;
     reserved 255 to 256;
 }
@@ -2361,17 +2361,6 @@ message AddWorktreeResponse {
     string canonicalized_path = 2;
 }
 
-message UpdateUserSettings {
-    uint64 project_id = 1;
-    string content = 2;
-    optional Kind kind = 3;
-
-    enum Kind {
-        Settings = 0;
-        Tasks = 1;
-    }
-}
-
 message GetPathMetadata {
     uint64 project_id = 1;
     string path = 2;

crates/proto/src/proto.rs

@@ -342,7 +342,6 @@ messages!(
     (FindSearchCandidates, Background),
     (FindSearchCandidatesResponse, Background),
     (CloseBuffer, Foreground),
-    (UpdateUserSettings, Foreground),
     (ShutdownRemoteServer, Foreground),
     (RemoveWorktree, Foreground),
     (LanguageServerLog, Foreground),
@@ -559,7 +558,6 @@ entity_messages!(
     UpdateContext,
     SynchronizeContexts,
     LspExtSwitchSourceHeader,
-    UpdateUserSettings,
     LanguageServerLog,
     Toast,
     HideToast,