Fix set-rn-version to account for codegen snapshot test files (#51157)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51157

test-js jobs are failing because the codegen snapshot tests generates a Podspecs withan hardcoded version that does not matches the version we are about to release.

This fix updates the script that set the RN version to make sure it also updates the Codegen snapshots.

This is a porting to `main` of [this PR](https://github.com/facebook/react-native/pull/51156).

## Changelog:
[Internal] - Fix set-rn-version to account for codegen snapshot test files

Reviewed By: fabriziocucci, cortinico

Differential Revision: D74321590

fbshipit-source-id: 6837e60a0a2834030680f7ec0c7584bf2622f33e