Description of problem:
Ignore differences with managed fields doesn't appear to work in OpenShift GitOps 
 
Prerequisites (if any, like setup, operators/versions):

ENV:
OCP: 4.11
Openshift GitOps 1.8.2
(ArgoCD 2.6.7)

 
The client is using the manager of the pod-security.kubernetes.io labels to ignore the differences. 

As per the update from the client in the description Ignore differences works only with JQ path expressions.

The differences are successfully ignored.
====================
ignoreDifferences:
  - kind: Namespace
    jsonPointers:
      - /metadata/labels/pod-security.kubernetes.io~1audit
      - /metadata/labels/pod-security.kubernetes.io~1audit-version
      - /metadata/labels/pod-security.kubernetes.io~1warn
      - /metadata/labels/pod-security.kubernetes.io~1warn-version
====================

While using the "managedFieldsManagers:" manager it does not seem to Ignore differences.
====================
ignoreDifferences:
  - kind: Namespace
    managedFieldsManagers:
      - cluster-policy-controller
====================

Actual results:

The ignoreDifferences does not work  when using the "managedFieldsManagers:"  and 

Expected results:

The sync should work with ignoreDifferences  when using the "managedFieldsManagers:"  in ArgoCD. 

Build Details:
Openshift GitOps 1.8.2
(ArgoCD 2.6.7)

Additional details:

1. There already exists an ongoing upstream bug: https://github.com/argoproj/argo-cd/issues/9071