Work towards getting isolated built-in extension compiles

For #271167

This makes it so our built-in extensions can mostly be built using `tsc` on the command line. Previously the extensions were picking up a lot of typing info from the root `node_modules` that meant they weren't truly independent

extensions/json-language-features/server/package.json

@@ -20,7 +20,7 @@
     "vscode-uri": "^3.1.0"
   },
   "devDependencies": {
-    "@types/mocha": "^9.1.1",
+    "@types/mocha": "^10.0.10",
     "@types/node": "22.x"
   },
   "scripts": {

extensions/json-language-features/server/tsconfig.json

@@ -9,6 +9,9 @@
 			"WebWorker"
 		],
 		"module": "Node16",
+		"typeRoots": [
+			"../node_modules/@types"
+		]
 	},
 	"include": [
 		"src/**/*"