rhel.next/images.conf: enable building of all internal RHEL images

Merge Request Required Information

Summary of Changes

Image Builder can already build all internal RHEL image types. The fact that RHUI client is not yet available does not block their building as part of the nightly composes. So let's start building them now to make them part of the release machine.

Tested internally manually via:

• ec2 https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66372400
• ec2-ha https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66372473
• ec2-sap https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66373361
• azure-rhui https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66373598
• azure-sap-rhui https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=66373675

Approved Development Ticket(s)

https://issues.redhat.com/browse/COMPOSER-2357