feat(react-scripts): allow testMatch for jest config (#9114)

resolves #8637

Author: favna

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

@@ -87,6 +87,7 @@ module.exports = (resolve, rootDir, isEjecting) => {
     'resetModules',
     'restoreMocks',
     'snapshotSerializers',
+    'testMatch',
     'transform',
     'transformIgnorePatterns',
     'watchPathIgnorePatterns',