@sentry/react-native/scripts/expo-upload-sourcemaps.js patch

Lets us specify the output directory for the sourcemaps via an environment variable.

@sentry/react-native/dist/js/tools/sentryMetroSerializer.js patch

Patch of this: https://github.com/getsentry/sentry-react-native/issues/5180#issuecomment-3311772038

Will be fixed in an upcoming release of @sentry/react-native - remove when available.