Test: refactor check-network to hydrophone

[tico88612]

What type of PR is this?

/kind design

What this PR does / why we need it:

Remove netchecker (our self-test)

Which issue(s) this PR fixes:

Related #12715

Special notes for your reviewer:

POC Hydrophone

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[k8s-ci-robot]

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[tico88612]

/label tide/merge-method-merge

[tico88612]

/hold after 2.30 release cut.

[tico88612]

/retest-failed

[tico88612]

Raising memory because conformance test.

https://gitlab.com/kargo-ci/kubernetes-sigs-kubespray/-/jobs/12262293572#L812

{
                        "type": "DisruptionTarget",
                        "observedGeneration": 1,
                        "status": "True",
                        "lastProbeTime": null,
                        "lastTransitionTime": "2025-11-29T07:23:55Z",
                        "reason": "TerminationByKubelet",
                        "message": "The node was low on resource: memory. Threshold quantity: 100Mi, available: 101276Ki. Container conformance-container was using 136628Ki, request is 0, has larger consumption of memory. Container output-container was using 364Ki, request is 0, has larger consumption of memory. "
},

[VannTen]

Btw, not sure if you had read the conversation on slack : https://kubernetes.slack.com/archives/C78F00H99/p1763150495755689

[tico88612]

@VannTen I read that before.

I cherry-picked some tests here, if we just want to test whether the pods can connect to each other normally.

networking_check: "\\[sig-network\\] Networking Granular Checks.+\\[Conformance\\]"
  block:
  - name: Run the networking granular checks
    command: "{{ hydrophone_path }} --focus=\"{{ networking_check }}\" --parallel {{ hydrophone_parallel }}"

https://github.com/kubernetes/kubernetes/blob/15673d04e30c711a7bb0f0efe6abf4baead1463b/test/conformance/testdata/conformance.yaml#L1822-L1873