Fixes #36723 - Remove Fedora/Red Hat Atomic related code

As far as I can see this has been EOL for a few years now. Red Hat
Atomic went EOL in 2021.

Fixes #36759 - only call allowed transpilers

CVE-2022-3874: OS command injection via ct_command and fcct_command

Instead of allowing to call any command by changing a setting, only
allow specific paths to ct/fcct. If the user needs a different path,
they can set it via settings.yaml.

Fixes #36663 - Add permission to modify LookupValue resource

This is necessary when using gql to allow non-admin users
to modify lookup-key values.

Fixes #36659 - Drop CentOS 8 mirror

The CentOS 8 mirror is for CentOS Linux 8, but that's EOL and removed
from the mirrors.

• ...and fix comment typos

Fixes #36189 - Add AlmaLinux UEFI provisioning support

In pxegrub2_chainload.erb various paths are tried, but the
/EFI/almalinux/grubx64.efi path is missing. This causes the server
to refuse to boot.

To make it easier to use the AlmaLinux installation medium is added.

Fixes #36395 - move value setting to seed

Fixes #29939 - drop category column from settings

Settings table was holding category column to support old style of
settings, but it is now ready to be decomissioned as plugins were given
enough time.

Fixes #35866 - Make RSS notification expire after 1 month

Fixes #35642 - update the message in the new UI to display the host's creator

Add `creator_id` property to the Host model to save the user who created each host.
This property is used in the new host details UI to display the user who created the host.