Add moduleNameMapper to supported keys

Add moduleNameMapper to supported keys for overriding in createJestConfig.js in order to mock worker.js files to successfully run through Jest

Author: Valerii Gusev

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -62,6 +62,7 @@ module.exports = (resolve, rootDir, isEjecting) => {
     'coverageReporters',
     'coverageThreshold',
     'snapshotSerializers',
+    'moduleNameMapper',
   ];
   if (overrides) {
     supportedKeys.forEach(key => {