fix: add feedback when yarn publish runs with unchanged version

[Goldyvaiiii]

Fixes #2940

This PR adds a feedback message when yarn publish proceeds without a version change.

Previously, the command would continue silently, which could make it unclear whether a new version was actually published.

With this change, users now get a clear message indicating that the version remains unchanged, improving transparency during the publish process.

[Goldyvaiiii]

Hey! This adds a small UX improvement to make yarn publish clearer when the version hasn’t changed. Happy to tweak the message if needed.