Use a better type for language IDs field (#35566)

Part of the preparation for proto capabilities.

Release Notes:

- N/A

crates/project/src/lsp_command.rs

@@ -3580,6 +3580,18 @@ impl LspCommand for GetCodeLens {
     }
 }
 
+impl LinkedEditingRange {
+    pub fn check_server_capabilities(capabilities: ServerCapabilities) -> bool {
+        let Some(linked_editing_options) = capabilities.linked_editing_range_provider else {
+            return false;
+        };
+        if let LinkedEditingRangeServerCapabilities::Simple(false) = linked_editing_options {
+            return false;
+        }
+        true
+    }
+}
+
 #[async_trait(?Send)]
 impl LspCommand for LinkedEditingRange {
     type Response = Vec<Range<Anchor>>;
@@ -3591,16 +3603,7 @@ impl LspCommand for LinkedEditingRange {
     }
 
     fn check_capabilities(&self, capabilities: AdapterServerCapabilities) -> bool {
-        let Some(linked_editing_options) = &capabilities
-            .server_capabilities
-            .linked_editing_range_provider
-        else {
-            return false;
-        };
-        if let LinkedEditingRangeServerCapabilities::Simple(false) = linked_editing_options {
-            return false;
-        }
-        true
+        Self::check_server_capabilities(capabilities.server_capabilities)
     }
 
     fn to_lsp(

crates/project/src/lsp_store.rs

@@ -5069,10 +5069,7 @@ impl LspStore {
                     local
                         .language_servers_for_buffer(buffer, cx)
                         .filter(|(_, server)| {
-                            server
-                                .capabilities()
-                                .linked_editing_range_provider
-                                .is_some()
+                            LinkedEditingRange::check_server_capabilities(server.capabilities())
                         })
                         .filter(|(adapter, _)| {
                             scope