[component/clusteragent] Change anti-affinity to "preferred" #582
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What does this PR do?
Changes the DCA anti-affinity from "required" to "preferred".
This is because when using "required" agent updates can't work on clusters with 1 node.
We're already using "preferred" in the cluster check runners.
Describe your test plan
Deploy in a cluster with one node. Make an update that affects the DCA, for example, enable/disable the orchestrator explorer feature. Check that the new DCA pod is deployed correctly.