fix: don't throw an error on stderr

[hannojg]

When running release profiler i was getting errors because there was a mismatch between the react native version when it tries to run npx react-native (the cli tool prints a warning, which is in stderr in which case our lib fails and throws an error):

i fixed this by:

• not using npx but resolve the path to the cli manually, this way we can be sure to always use the react native version bundled with the app
• if we were able to parse the config there is no need to throw an error, we can just print it as warning

[hannojg]

I know, one day the time will come where you will review @Szymon20000
And until this day I will never give up my hopes