Remove the `unpublish` method and mutation
What does this MR do and why?
Remove the unpublish
method and mutation
We do not need this method or the corresponding mutation.
Changelog: removed
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.