CNTRLPLANE-2683: Add network policies to openshift-etcd pods

[dusk125]

This PR adds network policies for the pods that exist in the openshift-etcd namespace that are managed by the cluster-etcd-operator: guard, installer, revision pruner pods.

It was suggested to have an empty policy for etcd (as it's a hostNetwork pod so ignores network policies), to act as documentation and proof that it wasn't accidentally missed.

[openshift-ci-robot]

@dusk125: This pull request references CNTRLPLANE-2683 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.23.0" version, but no target version was set.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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@dusk125: 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
ci/prow/e2e-aws-ovn-serial-1of2	7d7a112	link	true	/test e2e-aws-ovn-serial-1of2
ci/prow/unit	7d7a112	link	true	/test unit
ci/prow/e2e-aws-ovn-single-node	7d7a112	link	true	/test e2e-aws-ovn-single-node

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[openshift-ci-robot]

@dusk125: This pull request references CNTRLPLANE-2683 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.23.0" version, but no target version was set.

Details

In response to this:

This PR adds network policies for the pods that exist in the openshift-etcd namespace that are managed by the cluster-etcd-operator: guard, installer, revision pruner pods.

It was suggested to have an empty policy for etcd (as it's a hostNetwork pod so ignores network policies), to act as documentation and proof that it wasn't accidentally missed.

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 openshift-eng/jira-lifecycle-plugin repository.

[dusk125]

/label tide/merge-method-squash

[dusk125]

Accidentally opened this against openshift-4.23 and not main... closing in favor of #1544