Fantom: Enable hermesParser in Metro Transform (#52021)

Summary:
Pull Request resolved: #52021

Enables the `hermesParser` option in Fantom tests.

Notably, this configures parsing with `hermes-parser` to use `reactRuntimeTarget: '19'`.

Changelog:
[Internal]

Reviewed By: robhogan

Differential Revision: D76641340

fbshipit-source-id: a2dcdbe8cab838481dd37c251d03d1e6fffdf346

Author: yungsters

private/react-native-fantom/config/metro.config.js

@@ -55,6 +55,7 @@ const config /*: InputConfigT */ = {
     // We need to wrap the default transformer so we can run it from source
     // using babel-register.
     babelTransformerPath: path.resolve(__dirname, 'metro-babel-transformer.js'),
+    hermesParser: true,
   },
   serializer: {
     // Force an empty list so Metro doesn't inject InitializeCore in tests.