Add deprecations to CAS and Crowd global navigation items
What does this MR do and why?
Companion MR to: gitlab!95017 (merged).
Adds (deprecated)
to some entries on the global nav, per: https://docs.gitlab.com/ee/development/documentation/versions.html#deprecate-a-page-or-topic.
Merge request 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 merge request.