Add CMA support to must-gather

As an OpenShift developer, I would like must-gather to collect info helpful to diagnosing issues with Custom Metrics Autoscaler. Please gather information similar to what one could get from running the following commands:

oc get -A kedacontrollers.keda.sh -o yaml
oc get -A scaledjobs.keda.sh -o yaml
oc get -A scaledobjects.keda.sh -o yaml
oc get -A triggerauthentications.keda.sh -o yaml
oc get csv -n openshift-keda -l operators.coreos.com/openshift-custom-metrics-autoscaler-operator.openshift-keda -o yaml

(these probably don't need to be done since they're probably already in must-gather, but please verify)
oc get deployment -n openshift-keda -o yaml
oc get operatorgroup -n openshift-keda -o yaml
oc get subscription -n openshift-keda -o yaml

Make sure that the script ignores any failures to fetch (as might happen if the CRDs haven't been added to the cluster when the operator is installed).