Migrate all samples to eslint 9

Switches all samples to use eslint 9 with flat configs. I've tried to migrate existing settings as much as possible. However our eslint configs were also inconsistent so I've tried to align these too

chat-tutorial/.eslintrc.json

@@ -1,30 +0,0 @@
-{
-    "root": true,
-    "parser": "@typescript-eslint/parser",
-    "parserOptions": {
-        "ecmaVersion": 6,
-        "sourceType": "module"
-    },
-    "plugins": [
-        "@typescript-eslint"
-    ],
-    "rules": {
-        "@typescript-eslint/naming-convention": [
-            "warn",
-            {
-                "selector": "import",
-                "format": [ "camelCase", "PascalCase" ]
-            }
-        ],
-        "@typescript-eslint/semi": "warn",
-        "curly": "warn",
-        "eqeqeq": "warn",
-        "no-throw-literal": "warn",
-        "semi": "off"
-    },
-    "ignorePatterns": [
-        "out",
-        "dist",
-        "**/*.d.ts"
-    ]
-}

chat-tutorial/eslint.config.mjs

@@ -0,0 +1,43 @@
+/**
+ * ESLint configuration for the project.
+ * 
+ * See https://eslint.style and https://typescript-eslint.io for additional linting options.
+ */
+// @ts-check
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import stylistic from '@stylistic/eslint-plugin';
+
+export default tseslint.config(
+	{
+		ignores: [
+			'out'
+		]
+	},
+	js.configs.recommended,
+	...tseslint.configs.recommended,
+	...tseslint.configs.stylistic,
+	{
+		plugins: {
+			'@stylistic': stylistic
+		},
+		rules: {
+			'curly': 'warn',
+			'@stylistic/semi': ['warn', 'always'],
+			'@typescript-eslint/no-empty-function': 'off',
+			'@typescript-eslint/naming-convention': [
+				'warn',
+				{
+					'selector': 'import',
+					'format': ['camelCase', 'PascalCase']
+				}
+			],
+			'@typescript-eslint/no-unused-vars': [
+				'error',
+				{
+					'argsIgnorePattern': '^_'
+				}
+			]
+		}
+	}
+);

chat-tutorial/package.json

@@ -12,7 +12,7 @@
   ],
   "activationEvents": [],
   "main": "./out/extension.js",
-"contributes": {
+  "contributes": {
     "chatParticipants": [
       {
         "id": "chat-tutorial.code-tutor",
@@ -34,19 +34,20 @@
     "compile": "tsc -p ./",
     "watch": "tsc -watch -p ./",
     "pretest": "npm run compile && npm run lint",
-    "lint": "eslint src --ext ts",
+    "lint": "eslint",
     "test": "node ./out/test/runTest.js"
   },
   "devDependencies": {
-    "@types/vscode": "^1.93.0",
+    "@eslint/js": "^9.13.0",
+    "@stylistic/eslint-plugin": "^2.9.0",
     "@types/mocha": "^10.0.3",
     "@types/node": "18.x",
-    "@typescript-eslint/eslint-plugin": "^6.9.0",
-    "@typescript-eslint/parser": "^6.9.0",
-    "eslint": "^8.52.0",
+    "@types/vscode": "^1.93.0",
+    "@vscode/test-electron": "^2.3.6",
+    "eslint": "^9.13.0",
     "glob": "^10.3.10",
     "mocha": "^10.2.0",
     "typescript": "^5.2.2",
-    "@vscode/test-electron": "^2.3.6"
+    "typescript-eslint": "^8.11.0"
   }
 }