chore: add unit test for VexManagement, Dashboard, and ImageDetails

[NickChungSUSE]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.42%. Comparing base (fb8f8b2) to head (90382ef).

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #147       +/-   ##
=========================================
+ Coverage      0   93.42%   +93.42%     
=========================================
  Files         0       25       +25     
  Lines         0     4169     +4169     
  Branches      0       59       +59     
=========================================
+ Hits          0     3895     +3895     
- Misses        0      274      +274     

Flag	Coverage Δ
unit-tests	93.42% <ø> (?)

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