[release-4.21] HyperShift: relax ovnkube-control-plane zone anti-affinity

[ricky-rav]

The required zone in the anti-affinity section on the managed ovnkube-control-plane deployment can prevent scheduling when the management cluster has one zone only. Replace it with a hard hostname anti-affinity (guaranteeing that two replicas land on different nodes) and a soft zone anti-affinity (preferring different zones when possible).

(cherry picked from commit 223579a)

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@ricky-rav: 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/security	c120f3d	link	false	/test security
ci/prow/4.21-upgrade-from-stable-4.20-e2e-azure-ovn-upgrade	c120f3d	link	false	/test 4.21-upgrade-from-stable-4.20-e2e-azure-ovn-upgrade
ci/prow/e2e-metal-ipi-ovn-dualstack-bgp-local-gw	c120f3d	link	true	/test e2e-metal-ipi-ovn-dualstack-bgp-local-gw
ci/prow/e2e-azure-ovn-upgrade	c120f3d	link	true	/test e2e-azure-ovn-upgrade
ci/prow/e2e-gcp-ovn	c120f3d	link	true	/test e2e-gcp-ovn

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