sfdx force: package:version:promote - add validate only option

[arafesthain]

Is your feature request related to a problem? Please describe.

I'm always frustrated when I try to promote a version with my "master/main" branch pipeline and get "You already promoted a package version with this major.minor.patch version number. For a given major.minor.patch number, you can promote only one version."

What are you trying to do
promoting version of unlock package

Describe the solution you'd like
Add option validate only on the command line in order for the build pipeline to shift left (in the dev cycle) the error catching.

Describe alternatives you've considered
Automatically increment Z (patch) version

[github-actions[bot]]

Thank you for filing this feature request. We appreciate your feedback and will review the feature at our next grooming or sprint planning session. We prioritize feature requests with more upvotes and comments.

[eneag-sf]

yes please! we need this.✅

[git2gus[bot]]

This issue has been linked to a new work item: W-11793769