Notify users about what to do when a default namespace is not available

Mark Chaorequested to merge
578115-message into master

What does this MR do and why?

Notify users about what to do when a default namespace is not available.

References

Screenshots or screen recordings

Currently the screenshots are weird but frontend will assist to fix it.

Update:

pro core
Screenshot_2025-10-24_at_15.20.39 Screenshot_2025-10-24_at_16.04.55

How to set up and validate locally

  1. Login as Duo Pro user, visit http://gdk.test:3000/dashboard/ and http://gdk.test:3000/gitlab-org/gitlab-test/ and see Duo Chat works as expected
  2. Open ee/app/models/ee/user_preference.rb, modify get_default_duo_namespace so it returns nil.
  3. Revisit http://gdk.test:3000/dashboard/ and see message linking to User Preference Page.
  4. Login as Duo Core user, visit http://gdk.test:3000/dashboard/ and see message hinting the user to visit the project page
  5. Login as someone without any Duo access, visit http://gdk.test:3000/dashboard/ and see the generic message hinting the user to ask the admin.

MR acceptance checklist

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Related to #578115

Edited by Anastasia Khomchenko

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