fix validation error handling on API

[bobcallaway]

Fixes: #2209

[codecov]

Codecov Report

Attention: Patch coverage is 49.01961% with 26 lines in your changes missing coverage. Please review.

Project coverage is 51.41%. Comparing base (488eb97) to head (ca96b01).
Report is 184 commits behind head on main.

Files	Patch %	Lines
pkg/types/jar/v0.0.1/entry.go	10.00%	9 Missing ⚠️
pkg/api/entries.go	0.00%	6 Missing ⚠️
pkg/types/alpine/v0.0.1/entry.go	60.00%	2 Missing ⚠️
pkg/types/error.go	0.00%	2 Missing ⚠️
pkg/types/helm/v0.0.1/entry.go	60.00%	2 Missing ⚠️
pkg/types/rpm/v0.0.1/entry.go	66.66%	2 Missing ⚠️
pkg/types/hashedrekord/v0.0.1/entry.go	88.88%	1 Missing ⚠️
pkg/types/rekord/v0.0.1/entry.go	75.00%	1 Missing ⚠️
pkg/types/tuf/v0.0.1/entry.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2217       +/-   ##
===========================================
- Coverage   66.46%   51.41%   -15.05%     
===========================================
  Files          92      190       +98     
  Lines        9258    19470    +10212     
===========================================
+ Hits         6153    10011     +3858     
- Misses       2359     8382     +6023     
- Partials      746     1077      +331     

Flag	Coverage Δ
e2etests	50.23% <0.00%> (+2.67%)	⬆️
unittests	42.99% <49.01%> (-4.70%)	⬇️

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