fix(helmvalues): write helm image-name with or without registry url

[chengfang]

Fixes #974

When writing updates to helm values file in git repo, image updater checks the image-name format in the target helm values file: if it's short (e.g., org/image), or long (e.g., docker.io/org/image). If the original image-name is short format, then image updater converts the full image name to short one before writing it out.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.29412% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.26%. Comparing base (8c42fca) to head (6e1d5a0).

Files with missing lines	Patch %	Lines
pkg/argocd/update.go	83.92%	5 Missing and 4 partials ⚠️
registry-scanner/pkg/image/image.go	91.66%	1 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           master-annotation-based    #1312      +/-   ##
===========================================================
+ Coverage                    72.06%   72.26%   +0.19%     
===========================================================
  Files                           45       45              
  Lines                         4189     4255      +66     
===========================================================
+ Hits                          3019     3075      +56     
- Misses                        1005     1011       +6     
- Partials                       165      169       +4     

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[dkarpele]

I think it makes sense to add tests to Test_MarshalParamsOverride from update_test.go. The change to marshalParamsOverride is quite significant.