fix(mocha-runner): clear error when require esm

[nicojs]

Provide a clear error message when users configure mochaOptions.require to include "esm". You should provide it as a node argument instead.

{
  "$schema": "./node_modules/@stryker-mutator/core/schema/stryker-schema.json",
  "testRunner": "mocha",
  "mochaOptions": {
-   "require": ["esm"]
  },
+ "testRunnerNodeArgs": ["--require", "esm"]
}

Fixes #3014

[nicojs]

The error message looks like this:

21:08:07 (27028) ERROR Stryker Unexpected error occurred while running Stryker Error: Error: Config option "mochaOptions.require" does not support "esm", please use "testRunnerNodeArgs": ["--require", "esm"] instead. See #3014 for more information.
Error: Config option "mochaOptions.require" does not support "esm", please use "testRunnerNodeArgs": ["--require", "esm"] instead. See #3014 for more information.