chore: Add unit test to cover apps health status in an app in any namespace context

[OpenGuidou]

Adding unit test to cover case fixed in #22944.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[bunnyshell]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.21%. Comparing base (09b5cbd) to head (6286a3b).
⚠️ Report is 824 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #23693      +/-   ##
==========================================
- Coverage   60.22%   60.21%   -0.02%     
==========================================
  Files         346      346              
  Lines       59197    59202       +5     
==========================================
- Hits        35653    35648       -5     
- Misses      20686    20689       +3     
- Partials     2858     2865       +7     

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[aali309]

LGTM!

[crenshaw-dev]

Thanks!