User story

As a cluster admin I do not want the WMCO pod to be preempted by user workloads.

Description

Please see Re: [aos-devel] Critical or not for more details.
TL;DR:
If you want your operator/operand not to be preempted by user-workload but still be OOMKilled use system-cluster-critical priority class

Acceptance Criteria

WMCO pod must use system-cluster-critical priority class