As a cluster admin I want to set a cluster wide setting for hiding the "Getting started resources" banner from Overview, for all the console users.

AC: 

• Add new field to the console-operator's config, to its 'spec.customization' section, which would set the console. New field should be named 'GettingStartedBanner', which should be an enum, with states "Show" and "Hide".
• By default the state should be "Enabled"
• Pass the state variable to the console-config CM
• Add e2e and integration test

RFE: https://issues.redhat.com/browse/RFE-4475