Unblock `run_fantom_tests` by pinning react-native-android to v18.0 (#53732)

Summary:
This temporarly unblocks `run_fantom_tests` till we find a solution for the docker image bump. See:
- https://github.com/react-native-community/docker-android/pull/242#issuecomment-3280029122

## Changelog:

[INTERNAL] -

Pull Request resolved: https://github.com/facebook/react-native/pull/53732

Test Plan: CI

Reviewed By: cipolleschi

Differential Revision: D82212022

Pulled By: cortinico

fbshipit-source-id: 652926addf12cc2d88ac2139d3ec58a266ced9ef