feat(gitops-engine): show and format detailed field changes in StatefulSet immutable field errors

[aali309]

Fixes: #21209
Part of: #21209
Replaces: argoproj/gitops-engine#654

This PR Improves error messages when attempting to modify immutable fields in StatefulSets by showing exactly which fields changed and their before/after values.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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Before the change:

After the change:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.22%. Comparing base (d6f25a1) to head (dbb9c63).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #25171      +/-   ##
==========================================
- Coverage   62.24%   62.22%   -0.03%     
==========================================
  Files         351      351              
  Lines       49231    49231              
==========================================
- Hits        30643    30633      -10     
- Misses      15663    15673      +10     
  Partials     2925     2925              

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