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/vscode-api-tests/package-lock.json

@@ -9,7 +9,7 @@
       "version": "0.0.1",
       "license": "MIT",
       "devDependencies": {
-        "@types/mocha": "^9.1.1",
+        "@types/mocha": "^10.0.10",
         "@types/node": "22.x",
         "@types/node-forge": "^1.3.11",
         "node-forge": "^1.3.1",
@@ -20,10 +20,11 @@
       }
     },
     "node_modules/@types/mocha": {
-      "version": "9.1.1",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-9.1.1.tgz",
-      "integrity": "sha512-Z61JK7DKDtdKTWwLeElSEBcWGRLY8g95ic5FoQqI9CMx0ns/Ghep3B4DfcEimiKMvtamNVULVNKEsiwV3aQmXw==",
-      "dev": true
+      "version": "10.0.10",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.10.tgz",
+      "integrity": "sha512-xPyYSz1cMPnJQhl0CLMH68j3gprKZaTjG3s5Vi+fDgx+uhG9NOXwbVt52eFS8ECyXhyKcjDLCBEqBExKuiZb7Q==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/@types/node": {
       "version": "22.13.10",