Update quay.io/kubevirt/virt-controller Docker tag to v1.2.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/kubevirt/virt-controller		minor	v1.1.1 -> v1.2.0
quay.io/kubevirt/virt-controller	stage	minor	v1.1.1 -> v1.2.0

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