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/collab/src/rpc.rs

@@ -340,9 +340,6 @@ impl Server {
             .add_request_handler(forward_read_only_project_request::<proto::LspExtCancelFlycheck>)
             .add_request_handler(forward_read_only_project_request::<proto::LspExtRunFlycheck>)
             .add_request_handler(forward_read_only_project_request::<proto::LspExtClearFlycheck>)
-            .add_request_handler(
-                forward_read_only_project_request::<proto::LanguageServerIdForName>,
-            )
             .add_request_handler(forward_read_only_project_request::<proto::GetDocumentDiagnostics>)
             .add_request_handler(
                 forward_mutating_project_request::<proto::RegisterBufferWithLanguageServers>,

crates/collab/src/tests/editor_tests.rs

@@ -24,10 +24,7 @@ use language::{
 };
 use project::{
     ProjectPath, SERVER_PROGRESS_THROTTLE_TIMEOUT,
-    lsp_store::{
-        lsp_ext_command::{ExpandedMacro, LspExtExpandMacro},
-        rust_analyzer_ext::RUST_ANALYZER_NAME,
-    },
+    lsp_store::lsp_ext_command::{ExpandedMacro, LspExtExpandMacro},
     project_settings::{InlineBlameSettings, ProjectSettings},
 };
 use recent_projects::disconnected_overlay::DisconnectedOverlay;
@@ -3786,11 +3783,18 @@ async fn test_client_can_query_lsp_ext(cx_a: &mut TestAppContext, cx_b: &mut Tes
     cx_b.update(editor::init);
 
     client_a.language_registry().add(rust_lang());
-    client_b.language_registry().add(rust_lang());
     let mut fake_language_servers = client_a.language_registry().register_fake_lsp(
         "Rust",
         FakeLspAdapter {
-            name: RUST_ANALYZER_NAME,
+            name: "rust-analyzer",
+            ..FakeLspAdapter::default()
+        },
+    );
+    client_b.language_registry().add(rust_lang());
+    client_b.language_registry().register_fake_lsp_adapter(
+        "Rust",
+        FakeLspAdapter {
+            name: "rust-analyzer",
             ..FakeLspAdapter::default()
         },
     );