Fixes #37011 - Apply latest Ubuntu Autoinstall userdata changes

• Add explicit fallback for offline installation
• Replace deprecated lock-passwd with lock_passwd
• Remove empty ssh keys array if none provided

Fixes #37193 - trap ERR not supported on dash

Fixes #36502 - iPXE Discovery Only Works on net0

Fixes #37189 - Registration before & after snippets

before_registration & after_registration snippets allow
users to add their code to the template without directly editing it.

Fixes #37142 - Cloud-init breaks due to newline

This fixes cloud-init based deployment to Proxmox for Debian, Ubuntu,
and SUSE Linux Enterprise Server. Previously, deployments failed due to
a newline in the echo command.

Fixes #37016 - stop trying to report CV / LCE for hypervisors

Fixes #37034 - Replace apt-key on Debian/Ubuntu

Fixes #37010 - Support safe navigation operator in safemode

Safemode 1.4.0 has added support for this. This makes sure that version
is included.

Fixes #32359 - Entitlement report generation now shows all entitlements by default.

Modified gitignore to exclude .yardoc directory.

Fixes #36747 - create new snippet for subscription-manager setup

This snippet replaces the use of the katello-ca-consumer RPM for host
registration. It incorporates the necessary code from the Global Registration
template to streamline subscription-manager configuration during provisioning.