Promote template version button visible for `member` role

[matifali]

• A user with a member role can list all versions of a template and click the Promote button.
  • This action currently does nothing (no-op).
  • Suggestion: Disable or hide the Promote button to prevent accidental clicks.

• When clicking on a template version, users encounter a 404 error with a vague message.
  • Suggestion: Display a clear RBAC (Role-Based Access Control) error explaining that the user cannot access this page.

[stirby]

Duplicate of #15850

Let's prioritize this for next sprint. It's bothering customers.