Add admin_parent_link permission to hide Add button in issue
What does this MR do and why?
The user permission admin_parent_link
will help to hide the add button on an issue in case of guest user.
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.
Related to #387303 (closed)