Remove the logic for setting the nested `protocol` field in k8s objects containing an array of `ports`.

[haiyanmeng]

The logic was added in March 2021 as a workaround for a known k8s issue, which causes getting the declared fields for k8s objects containing an array of ports to fail. The fixes to the k8s issue have been merged into k8s 1.20 and 1.21:

1. https://github.com/kubernetes/kubernetes/pull/96317 (merged in 1.20)

2. https://github.com/kubernetes/kubernetes/pull/98576 (merged in 1.21).

k8s 1.21 is no longer supported on GKE and Anthos:

1. GKE release schedule: https://cloud.google.com/kubernetes-engine/docs/release-schedule

2. Anthos version and upgrade support: https://cloud.google.com/anthos/docs/version-and-upgrade-support

Therefore, we can remove the logic and related unit tests. We can keep the e2e test to make sure this change does not break things.

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[google-oss-prow[bot]]

@haiyanmeng: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kpt-config-sync-presubmit-e2e-multi-repo-test-group1	2dd18dea39ae97556d3ace01bebce006d15740d8	link	true	/test kpt-config-sync-presubmit-e2e-multi-repo-test-group1
kpt-config-sync-presubmit-e2e-multi-repo-test-group2	2dd18dea39ae97556d3ace01bebce006d15740d8	link	true	/test kpt-config-sync-presubmit-e2e-multi-repo-test-group2
kpt-config-sync-presubmit-e2e-multi-repo-test-group3	2dd18dea39ae97556d3ace01bebce006d15740d8	link	true	/test kpt-config-sync-presubmit-e2e-multi-repo-test-group3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[janetkuo]

/hold

Please ignore my message. I'm just testing prow settings in the repo.

[mikebz]

Is this WIP? If it is consider closing the PR and keeping the private branch or converting to draft.