[0.83] Skip set-rn-artifacts-version for PRs targeting stable branches

[cipolleschi]

Cherry-pick Request

Target Branch

0.83

Link to commit or PR to be picked

facebook/react-native#55807

Description

When a PR targets a -stable branch, github.ref_name is the PR branch (not ending in -stable), so the version script was incorrectly running. Added a check for github.base_ref to also skip the script when the PR target branch is a stable branch.

This fix is needed to ensure CI works correctly for PRs targeting stable branches.

[react-native-bot]

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[cortinico]

I've included this inside facebook/react-native#55722 so we probably don't need an explicit pick here.