distro/rhel86: enable auto-registration for azure

We want to ensure that cloud images connect to Red Hat[1] independently
of how the content was acquired (PAYG, BYOS, or marketplace).
This auto-registration feature is already enabled for AWS and this
patch enables it for Azure with the same recommended settings:

Services:
  rhsmcertd: Enabled (already done, so not changed in the patch)

/etc/rhsm/rhsm.conf:
  auto_registration: enabled
  auto_registration_interval: 60 (the default, so not explicitly set)
  manage_repos: false

The latter value `manage_repos` is left enabled (the default) in case
the user explicitly requested to have the system subscribed, i.e. the
`RHSMConfigWithSubscription` code path.

Regenerate the relevant test manifests and image information.

[1] https://cloud.redhat.com
[2] https://docs.google.com/document/d/1VeZFJxNUlyZMQJh6s3NA3RLvadqATsGxVet6uuP87_4

internal/distro/rhel86/distro.go

@@ -977,6 +977,23 @@ func newDistro(distroName string) distro.Distro {
 							Enabled: false,
 						},
 					},
+					SubMan: &osbuild.RHSMStageOptionsSubMan{
+						Rhsmcertd: &osbuild.SubManConfigRHSMCERTDSection{
+							AutoRegistration: common.BoolToPtr(true),
+						},
+						Rhsm: &osbuild.SubManConfigRHSMSection{
+							ManageRepos: common.BoolToPtr(false),
+						},
+					},
+				},
+				distro.RHSMConfigWithSubscription: {
+					SubMan: &osbuild.RHSMStageOptionsSubMan{
+						Rhsmcertd: &osbuild.SubManConfigRHSMCERTDSection{
+							AutoRegistration: common.BoolToPtr(true),
+						},
+						// do not disable the redhat.repo management if the user
+						// explicitly request the system to be subscribed
+					},
 				},
 			},
 			Grub2Config: &osbuild.GRUB2Config{