Azure scale: Disable host-level API availability checks

[nojnhuh]

This PR follows up from #35109 to propagate the config to skip host-level API server availability tests for Azure clusters. The clusters built with CAPZ only expose the control plane via a public load balancer where each node only has an internal IP, so the host-level checks continuously fail and add noise to the logs. e.g. from https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/ci-kubernetes-e2e-azure-scalability/1955357052398211072:

W0812 20:35:56.171581   37318 api_availability_measurement.go:83] execservice issue: problem with RunCommand(): output="+ curl --connect-timeout 5 -s -k -w '%{http_code}' -o /dev/null [https://10.0.0.6:443/readyz](https://10.0.0.6/readyz)\ncommand terminated with exit code 7\n", err=exit status 7
W0812 20:35:56.171611   37318 api_availability_measurement.go:86] host 10.0.0.6 not available; HTTP status code:

The changes from #35109 were tested by running the modified presubmit job and none of those logs appear anymore:
https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/kubernetes-sigs_cluster-api-provider-azure/5801/pull-cluster-api-provider-azure-load-test-custom-builds/1953910526153068544

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nojnhuh
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[alaypatel07]

Can we please modify the pre-submits the same way and trigger a run on this PR before merging this?

[alaypatel07]

#35109

The modified test here doesnot run testing/dra/config.yaml

[nojnhuh]

Actually API server availability isn't even measured for these DRA tests. I removed these changes and kept the one for the non-DRA test.

[alaypatel07]

/lgtm