Use getOnDiskWorkspaceFolders to fetch folders

extensions/ql-vscode/src/helpers.ts

@@ -799,14 +799,13 @@ export async function* walkDirectory(
  */
 
 export function getFirstWorkspaceFolder() {
-  const workspaceFolders = workspace.workspaceFolders;
+  const workspaceFolders = getOnDiskWorkspaceFolders();
 
   if (!workspaceFolders || workspaceFolders.length === 0) {
     throw new Error("No workspace folders found");
   }
 
-  const firstFolder = workspaceFolders[0];
-  const firstFolderFsPath = firstFolder.uri.fsPath;
+  const firstFolderFsPath = workspaceFolders[0];
 
   // For the vscode-codeql-starter repo, the first folder will be a ql pack
   // so we need to get the parent folder

extensions/ql-vscode/test/vscode-tests/cli-integration/skeleton-query-wizard.test.ts

@@ -83,11 +83,11 @@ describe("SkeletonQueryWizard", () => {
     jest.spyOn(workspace, "workspaceFolders", "get").mockReturnValue([
       {
         name: `codespaces-codeql`,
-        uri: { fsPath: storagePath },
+        uri: { fsPath: storagePath, scheme: "file" },
       },
       {
         name: "/second/folder/path",
-        uri: { fsPath: storagePath },
+        uri: { fsPath: storagePath, scheme: "file" },
       },
     ] as WorkspaceFolder[]);