Adding steps for patch operator install

[shane-snyder]

With the release versions removed from the previous docs commit, the patch operator needs to be installed to process the aro-thanos-af helm chart. Otherwise, it will throw the error below.

ensure CRDs are installed first, resource mapping not found for name: "cluster-monitoring-config-patcher" namespace: "patch-operator" from "": no matches for kind "Patch" in version "redhatcop.redhat.io/v1alpha1"
ensure CRDs are installed first, resource mapping not found for name: "user-workload-monitoring-config-patcher" namespace: "patch-operator" from "": no matches for kind "Patch" in version "redhatcop.redhat.io/v1alpha1"
ensure CRDs are installed first]

Updated aro-thanos-af change using patch operator

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[diana-sari]

thanks again for amending that and submitting PR!