Use a nicer command to tail pod logs

[puneetsarna]

While what we have also works, labels is a nicer
way to select k8s objects.

nginx-loadbalancer-kubernetes $ kubectl -n nlk logs -f $(kubectl -n nlk get po -l "app=nlk" --no-headers -o custom-columns=":metadata.name") time="2024-02-28T20:35:49Z" level=info msg="Settings::Initialize" time="2024-02-28T20:35:49Z" level=info msg="Certificates::Initialize" time="2024-02-28T20:35:49Z" level=info msg="Certificates::Run" I0228 20:35:49.398213 1 shared_informer.go:273] Waiting for caches to sync for nlk-handler I0228 20:35:49.500005 1 shared_informer.go:280] Caches are synced for nlk-handler

Proposed changes

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• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
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[puneetsarna]

@ciroque @chrisakker

[ciroque]

Looks good, thanks for the contribution!