Fix sortOptions removal when running edit command

[oli-f]

FIX: When running kustomize edit set image sortOptions was removed.

E.g. with

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

sortOptions:
  order: fifo

images:
- name: test
  newName: test

when running kustomize edit set image test=test:123, resulted in:

apiVersion: kustomize.config.k8s.io/v1beta1

kind: Kustomization

images:
- name: test
  newName: test
  newTag: "123"

(notice the missing sortOptions)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: oli-f / name: Oliver F. (554198f, 1873353)

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[stormqueen1990]

Hi there, @oli-f! 👋🏻

Thank you very much for your contribution! 🙏🏻

Could you please also add a test case to help us prevent regressions in the future?

Thanks in advance!

[k8s-ci-robot]

This PR has multiple commits, and the default merge method is: merge.
You can request commits to be squashed using the label: tide/merge-method-squash

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[oli-f]

I have added two read-and-write tests, which is the case during the edit operation - before there was only a write-and-read test:

• The first tests uses a complete in-order kustomization file, which needs to be manually updated if new features are introduced.
• The second test encodes an populated kustomization object, decodes it back and checks for equality. Using reflection it is ensured that only deprecated fields are allowed to be non zero/empty. This way it is ensured that this test is forwards-compatible.

Checking that all properties of the kustimization object are en-/decoded into the kustomization file is not part of this test.

[stormqueen1990]

/lgtm

[varshaprasad96]

Thanks for the contribution @oli-f!
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oli-f, varshaprasad96

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[stormqueen1990]

/lgtm
/label tide/merge-method-squash

@varshaprasad96 this will need another workflow approval after code changes.

[stormqueen1990]

/ok-to-test