Rename CI catalog licensed feature
What does this MR do and why?
For clarity, we've renamed the CI Private Catalog to CI Namespace Catalog. This MR updates the code to match.
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 #396691 (closed)