test(e2e): poll for grpcapi service deletion instead of kubectl wait

[Dav-14]

kubectl wait --for=delete can ignore --timeout and hang until chainsaw's
step timeout kills the script (signal: killed), which flaked the
gateway-grpcapi-sync deletion step on the K8s 1.31 runner. Replace it
with a bounded kubectl get poll so the assertion fails legibly if the
service is genuinely not garbage-collected.

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