Adds a NoDeletes function to the Syncer

[rspurgeon]

Summary

If the Syncer is configured with noDeletes true, deleteDuplicates and delete operations are skipped entirely in the diff() function.

Full changelog

• Adds NoDeletes function to Syncer. Usage of this feature in decK will come in a subsequent change.

Testing

Tests added using diff.NewSyncer() as calling deck gateway diff fails. This function is for a new deck command, which will not be exposed via deck gateway diff so updating deck doesn't make sense here

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 28.70%. Comparing base (d53b0d3) to head (b2956fa).

Files with missing lines	Patch %	Lines
pkg/diff/diff.go	0.00%	13 Missing ⚠️
tests/integration/test_utils.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   28.72%   28.70%   -0.02%     
==========================================
  Files         106      106              
  Lines       15814    15822       +8     
==========================================
  Hits         4542     4542              
- Misses      10793    10801       +8     
  Partials      479      479              

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