Align must-gather version with gitops-operator version and make images push to internal registry

[reginapizza]

Describe the solution you'd like

• We need to go through a secure build mechanism and switch to using registry.redhat.io
• We need to ensure that we produce a 'file version' with our must-gather output
• Our must-gather version should have an equivalent version for each supported version of the gitops-operator (even though our tool is agnostic of gitops-operator version)

The command to run the operator should be oc adm must-gather --image-stream=openshift/must-gather --image=[registry.redhat.io/openshift-gitops/gitops-must-gather-rhel8:[gitops_version]]

Additional context

This change has been asked for by CEE in order to have the gitops must-gather on https://access.redhat.com/solutions/5459251

Some resources to help explain versioning request:

• https://issues.redhat.com/issues/?jql=text%20~%20%22must-gather%20version%22 // Query showing this feature requested. We would get a similar JIRA.
• https://issues.redhat.com/browse/LOG-2962 // One of the requests
• report correct version when multiple images invoked openshift/must-gather#327 // How OCP did it.