cmd/k8s-operator: suppress egress-pod-readiness backoff logs

The egress Pod readiness reconciler polls each Service's health check
endpoint up to replicas*3 times per Pod. A freshly created Pod is initially
unreachable, so these backoff log lines carry no value and generate
significant noise.

Discard these logs so the per-poll message is no longer logged (the more
useful message "Pod is not yet added as an endpoint for all egress targets,
waiting..." is still logged once per reconcile).

Updates tailscale/tailscale#21079

Signed-off-by: Becky Pauley <becky@tailscale.com>
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