🌱 Add more unit testing around rukpak/convert

[perdasilva]

Description

Adds additional unit testing around rukpak/convert to facilitate the upcoming refactoring towards a bundle renderer

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]

Codecov Report

Attention: Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.51%. Comparing base (0bcdd61) to head (43a49ba).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...operator-controller/rukpak/util/testing/testing.go	91.11%	4 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #1912 +/- ##
==========================================
+ Coverage 69.33% 69.51% +0.18% 
==========================================
Files 67 68 +1 Lines 5312 5357 +45 ==========================================
+ Hits 3683 3724 +41 - Misses 1397 1401 +4 
Partials 232 232 

Flag	Coverage Δ
e2e	50.61% <ø> (-0.08%)	⬇️
unit	57.43% <91.11%> (+0.32%)	⬆️

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