add an extension sample for the cli test runner

helloworld-test-cli-sample/.gitignore

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+out
+node_modules
+.vscode-test/
+*.vsix

helloworld-test-cli-sample/.vscode-test.mjs

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+import { defineConfig } from '@vscode/test-cli';
+
+export default defineConfig({
+	files: 'out/test/**/*.test.js',
+});

helloworld-test-cli-sample/.vscode/launch.json

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+// A launch configuration that compiles the extension and then opens it inside a new window
+// Use IntelliSense to learn about possible attributes.
+// Hover to view descriptions of existing attributes.
+// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+{
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "Run Extension",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["--extensionDevelopmentPath=${workspaceFolder}"],
+			"outFiles": ["${workspaceFolder}/out/**/*.js"],
+			"preLaunchTask": "npm: watch"
+		}
+	]
+}

helloworld-test-cli-sample/.vscode/tasks.json

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+// See https://go.microsoft.com/fwlink/?LinkId=733558
+// for the documentation about the tasks.json format
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "watch",
+			"problemMatcher": "$tsc-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}

helloworld-test-cli-sample/README.md

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+# Hello World Test Sample
+
+This is the Hello World example with integration tests setup.
+
+You can find the accompanying documentation at https://code.visualstudio.com/api/working-with-extensions/testing-extension.
+
+## Demo
+
+https://github.com/microsoft/vscode-extension-samples/assets/2230985/d9253b37-53fb-4d7f-85ea-3459cbf5932e
+
+## Running the Sample
+
+- Run `npm install` in terminal to install dependencies
+- Install the [VS Code Extension Test Runner](https://marketplace.visualstudio.com/items?itemName=ms-vscode.extension-test-runner)
+- Start a task `npm: watch` to compile the code
+- Run tests, either by:
+	- Using the Test Explorer view, or
+	- By running `npm run test` con the commpand line