Rename set-rn-version script, mark as deprecated (#45184)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45184

This is a follow-up to D59055522.

> NOTE:This diff will be followed up by a merge of the set-rn-version script into set-version. (I had considered a rename to version-rn-artifacts, intentionally keeping this script separate and distinct from a future [lerna version + this script] setup — however the current UX and confusion with this naming would be too confusing. It can move into a util 👍🏻.)

- Rename `set-rn-version` to `set-rn-artifacts-version` (more accurate).
- Mark this script as deprecated.
    - For now, there are too many references to this script in CI test jobs to refactor away this entry point, so I am avoiding this — these should later be standardised to `set-version`.

Changelog: [Internal]

Reviewed By: christophpurrer

Differential Revision: D59058085

fbshipit-source-id: 4123ac73b5c7a2e07a1d1b6da61e0ad94fc31f84