task(auth): Have typescript target more files.

Because:
- We keep getting burned by '@fxa/' requires & imports

This Commit:
- Targets js files in tsconfig

packages/fxa-auth-server/tsconfig.json

@@ -16,6 +16,7 @@
   "include": [
     "bin/*", // Include bin so that it's included in `build-ts`, specifically for "tsc-alias".
     "lib/**/*.ts",
+    "lib/**/*.js",
     "scripts/**/*.ts"
   ]
 }