When specifying customProductName or customLogoFile in consoles.operator.openshift.io cluster, the no favicon is set on the web console . The customer want to be able to add its own favicon, ideally the same way as the customLogoFile, by creating a ConfigMap in the openshift-config namespace.

AC: 

• Add new field to console-operator's config customization API which will be a ConfigMapFileReference and will point to a ConfigMap in the openshift-config namespace.
• When the custom favicon is set we need to mount the ConfigMap into the console pod under '/var/favicon' path
• Add the path to the console-config ConfigMap in the openshift-console namespace
• Add e2e and unit tests