fix(iOS): bring back enableFixForViewCommandRace feature flag (#49126)

Summary:
As pointed out by RyanCommits the ReactNativeFactory PR removed `enableFixForViewCommandRace` feature flag by mistake. Reference: https://github.com/facebook/react-native/pull/46298/files

This PR re-adds the feature flag.

## Changelog:

[IOS] [FIXED] - Re-enable enableFixForViewCommandRace feature flag

Pull Request resolved: https://github.com/facebook/react-native/pull/49126

Test Plan: Not needed, the feature flag was there before refactor.

Reviewed By: huntie

Differential Revision: D69049668

Pulled By: cipolleschi

fbshipit-source-id: b7bf382c76878e72619145283fa8cc2c1046b486