[release-4.14] wait for the service to have endpoints before starting pollers

[openshift-cherrypick-robot]

This is an automated cherry-pick of #28242

/assign deads2k

[deads2k]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, openshift-cherrypick-robot

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 265bf9e and 2 for PR HEAD 416d7e2 in total

[openshift-ci]

@openshift-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-etcd-recovery	416d7e2	link	false	/test e2e-aws-etcd-recovery
ci/prow/e2e-aws-ovn-single-node-upgrade	416d7e2	link	false	/test e2e-aws-ovn-single-node-upgrade

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