Allow CodeQL checkout to be named ql

This makes it easier for cross-repo development with `semmle-code`, where the `codeql` repo is in a submodule in a directory named `ql`.

extensions/ql-vscode/test/vscode-tests/cli.ts

@@ -6,7 +6,10 @@ import { workspace } from "vscode";
  */
 function hasCodeQL() {
   const folders = workspace.workspaceFolders;
-  return !!folders?.some((folder) => folder.uri.path.endsWith("/codeql"));
+  return !!folders?.some(
+    (folder) =>
+      folder.uri.path.endsWith("/codeql") || folder.uri.path.endsWith("/ql"),
+  );
 }
 
 // describeWithCodeQL will be equal to describe if the CodeQL libraries are