fixes #36658 - only use {linux,initrd}efi for x86/64 KS PXEGrub2 EL7

Fixes #35124 - Fix preseed_kernel_options to work with full-host-bootdisk deployments

Update corresponding template snapshots.

Co-authored-by: Bastian Schmidt <schmidt@atix.de>

Fixes #36180 - iPXE provisioning template for Ubuntu autoinstall

Fixes #35286 - New PXEGrub2 template for Ubuntu Autoinstall

- Introduce new PXEGrub2 Autoinstall template
- Move network configuration out of PXELinux Autoinstall template to
new preseed_kernel_options_autoinstall snippet
- Add snapshot for preseed_kernel_options_autoinstall...

Fixes #34658 - Harmonize preseed templates

Fixes #20265 - Add UEFI Grub(2) templates for SUSE

Fixes #34302 - associate CentOS_Stream OS with the templates

Signed-off-by: Lukas Zapletal <lzap+git@redhat.com>

Fixes #34292 - support pxe_kernel_options in Preseed templates

Fixes #34265 - change more deprecated ks/sendmac Anaconda options

Fixes #33034 - add a description to all provisioning templates

This PR udpates all the templates metadata to provide at least minimal
description that is then stored in the DB and shown in the edit form.

Co-authored-by: Timo Goebel <mail@timogoebel.name>...