refactor: remove unused code

Author: Young-Flash

editors/code/src/lsp_ext.ts

@@ -46,9 +46,6 @@ export const rebuildProcMacros = new lc.RequestType0<null, void>("rust-analyzer/
 export const runFlycheck = new lc.NotificationType<{
     textDocument: lc.TextDocumentIdentifier | null;
 }>("rust-analyzer/runFlycheck");
-export const syntaxTree = new lc.RequestType<SyntaxTreeParams, string, void>(
-    "rust-analyzer/syntaxTree",
-);
 export const viewSyntaxTree = new lc.RequestType<ViewSyntaxTreeParams, string, void>(
     "rust-analyzer/viewSyntaxTree",
 );