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]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tico88612

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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. "
},