fix: update normalization for ignoreDifferences on server-side diff

[pjiang-dev]

fixes argoproj/argo-cd#17362 (comment)

When ignoreDifferences normalization removes fields before server-side apply, it causes validation errors because required fields (like image) are missing from the config sent to the Kubernetes API.

To avoid this issue we will

1. Skip the normalizer (ignoreDifferences) with a new option applyIgnoreDifference when performing server-side apply --dry-run
2. After predictedLive is performed, we can now normalize (ignoreDifferences) the config and live
3. Result will be a diff without those ignoreDifferences fields

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.

Project coverage is 47.22%. Comparing base (8849c3f) to head (8489316).
Report is 54 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/diff/diff.go	53.84%	4 Missing and 2 partials ⚠️
pkg/diff/diff_options.go	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #747      +/-   ##
==========================================
- Coverage   54.26%   47.22%   -7.05%     
==========================================
  Files          64       64              
  Lines        6164     6529     +365     
==========================================
- Hits         3345     3083     -262     
- Misses       2549     3191     +642     
+ Partials      270      255      -15     

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[leoluz]

PR is missing tests.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[leoluz]

LGTM