Do not reset rn-artifacts-version on release branch (#48572)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48572

Because of this extra step on build-android, we're seeing the version 1000.0.0-<SHA>
on commits on the release branch. This prevents it.

Changelog:
[Internal] [Changed] - Do not reset rn-artifacts-version on release branch

Reviewed By: cipolleschi

Differential Revision: D67975049

fbshipit-source-id: dace7c931ec310538c11c4b9e544fdc2241a1d0c