:sparkles: reduce use of carvel validators

[everettraven]

Description

• Reduces the use of the field change validators in carvel/kapp in favor of our own implementations. This makes the CRD Upgrade Safety pre-flight check more maintainable by allowing us to make bugfixes and changes in our implementation without having to contribute to carvel/kapp and wait for a new release.

• fixes #1248

• fixes #1246

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 77.87%. Comparing base (188858c) to head (787b148). Report is 102 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1269      +/-   ##
==========================================
+ Coverage   76.51%   77.87%   +1.36%     
==========================================
  Files          40       40              
  Lines        2363     2509     +146     
==========================================
+ Hits         1808     1954     +146     
  Misses        389      389              
  Partials      166      166              

Flag	Coverage Δ
e2e	54.52% <7.64%> (-3.33%)	:arrow_down:
unit	55.79% <100.00%> (+2.73%)	:arrow_up:

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[tmshort]

Where are we on this one?