Ask the user for permission to reload workspace

To make this a nicer experience for the user, we're adding a prompt
to let them know we're about to reload the workspace.

extensions/ql-vscode/src/helpers.ts

@@ -295,10 +295,20 @@ export async function prepareCodeTour(): Promise<void> {
       existsSync(toursFolderPath) &&
       !isCodespacesTemplate()
     ) {
+      const answer = await showBinaryChoiceDialog(
+        "We've detected you're in the CodeQL Tour repo. We will need to open the workspace file to continue. Reload?",
+      );
+
+      if (!answer) {
+        return;
+      }
+
       const tutorialWorkspaceUri = Uri.parse(tutorialWorkspacePath);
+
       void extLogger.log(
         `In prepareCodeTour() method, going to open the tutorial workspace file: ${tutorialWorkspacePath}`,
       );
+
       await commands.executeCommand("vscode.openFolder", tutorialWorkspaceUri);
     }
   }

extensions/ql-vscode/test/vscode-tests/no-workspace/helpers.test.ts

@@ -572,6 +572,9 @@ describe("isFolderAlreadyInWorkspace", () => {
 
 describe("prepareCodeTour", () => {
   let dir: tmp.DirResult;
+  let showInformationMessageSpy: jest.SpiedFunction<
+    typeof window.showInformationMessage
+  >;
 
   beforeEach(() => {
     dir = tmp.dirSync();
@@ -587,6 +590,10 @@ describe("prepareCodeTour", () => {
     jest
       .spyOn(workspace, "workspaceFolders", "get")
       .mockReturnValue(mockWorkspaceFolders);
+
+    showInformationMessageSpy = jest
+      .spyOn(window, "showInformationMessage")
+      .mockResolvedValue({ title: "Yes" });
   });
 
   afterEach(() => {
@@ -610,6 +617,7 @@ describe("prepareCodeTour", () => {
 
         await prepareCodeTour();
 
+        expect(showInformationMessageSpy).toHaveBeenCalled();
         expect(commandSpy).toHaveBeenCalledWith(
           "vscode.openFolder",
           Uri.parse(tutorialWorkspacePath),