Use new language server info on remote servers (#35682)

* Straightens out the `*_ext.rs` workflow for clangd and rust-analyzer:
no need to asynchronously query for the language server, as we sync that
information already.
* Fixes inlay hints editor menu toggle not being shown in the remote
sessions

Release Notes:

- Fixed inlay hints editor menu toggle not being shown in the remote
sessions

crates/proto/proto/lsp.proto

@@ -818,16 +818,6 @@ message LspResponse {
     uint64 server_id = 7;
 }
 
-message LanguageServerIdForName {
-    uint64 project_id = 1;
-    uint64 buffer_id = 2;
-    string name = 3;
-}
-
-message LanguageServerIdForNameResponse {
-    optional uint64 server_id = 1;
-}
-
 message LspExtRunnables {
     uint64 project_id = 1;
     uint64 buffer_id = 2;

crates/proto/proto/zed.proto

@@ -362,9 +362,6 @@ message Envelope {
         GetDocumentSymbols get_document_symbols = 330;
         GetDocumentSymbolsResponse get_document_symbols_response = 331;
 
-        LanguageServerIdForName language_server_id_for_name = 332;
-        LanguageServerIdForNameResponse language_server_id_for_name_response = 333;
-
         LoadCommitDiff load_commit_diff = 334;
         LoadCommitDiffResponse load_commit_diff_response = 335;
 
@@ -424,6 +421,7 @@ message Envelope {
     reserved 247 to 254;
     reserved 255 to 256;
     reserved 280 to 281;
+    reserved 332 to 333;
 }
 
 message Hello {

crates/proto/src/proto.rs

@@ -121,8 +121,6 @@ messages!(
     (GetImplementationResponse, Background),
     (GetLlmToken, Background),
     (GetLlmTokenResponse, Background),
-    (LanguageServerIdForName, Background),
-    (LanguageServerIdForNameResponse, Background),
     (OpenUnstagedDiff, Foreground),
     (OpenUnstagedDiffResponse, Foreground),
     (OpenUncommittedDiff, Foreground),
@@ -431,7 +429,6 @@ request_messages!(
     (UpdateWorktree, Ack),
     (UpdateRepository, Ack),
     (RemoveRepository, Ack),
-    (LanguageServerIdForName, LanguageServerIdForNameResponse),
     (LspExtExpandMacro, LspExtExpandMacroResponse),
     (LspExtOpenDocs, LspExtOpenDocsResponse),
     (LspExtRunnables, LspExtRunnablesResponse),
@@ -588,7 +585,6 @@ entity_messages!(
     OpenServerSettings,
     GetPermalinkToLine,
     LanguageServerPromptRequest,
-    LanguageServerIdForName,
     GitGetBranches,
     UpdateGitBranch,
     ListToolchains,