Remove technically unnecessary 'module' option from 'harness' config. (#40526)

Author: DanielRosenwasser

src/harness/tsconfig.json

@@ -2,7 +2,6 @@
     "extends": "../tsconfig-base",
     "compilerOptions": {
         "outFile": "../../built/local/harness.js",
-        "moduleResolution": "node",
         "types": [
             "node", "mocha", "chai"
         ],