🌱 Internal Rukpak Package Tests

[dtfranz]

Adds more tests to the packages migrated from rukpak.

Closes #1037

Reviewer Checklist

• [ ] API Go Documentation
• [ ] Tests: Unit Tests (and E2E Tests, if appropriate)
• [ ] Comprehensive Commit Messages
• [ ] Links to related GitHub Issue(s)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.85%. Comparing base (74959d0) to head (916f9e4). Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1100      +/-   ##
==========================================
+ Coverage   75.44%   76.85%   +1.40%     
==========================================
  Files          35       35              
  Lines        1918     1918              
==========================================
+ Hits         1447     1474      +27     
+ Misses        329      310      -19     
+ Partials      142      134       -8     

Flag	Coverage Δ
e2e	58.08% <ø> (-0.11%)	:arrow_down:
unit	54.58% <ø> (+3.70%)	:arrow_up:

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[dtfranz]

Overall looks good to me. Left a general comment for comparison of the image registry tests implemented here and in catalogd, but it doesn't need to be addressed for this PR to merge IMO.

It currently looks to me like I'll need to keep the low-level http response stuff in there for some of the error returns; I'll revisit this at another time and merge for now. Thank you!