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.

Testing WIP

Full changelog

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

Testing

Testing WIP, Draft PR for now.

• 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 10 lines in your changes missing coverage. Please review.

Project coverage is 29.88%. Comparing base (da91179) to head (ec4b0c8).

Files with missing lines	Patch %	Lines
pkg/diff/diff.go	0.00%	8 Missing ⚠️
pkg/file/readfile.go	0.00%	0 Missing and 1 partial ⚠️
pkg/file/writer.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   29.95%   29.88%   -0.07%     
==========================================
  Files         106      106              
  Lines       12589    12554      -35     
==========================================
- Hits         3771     3752      -19     
+ Misses       8358     8342      -16     
  Partials      460      460              

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