Foreman » Installer

Refs #37296 - Drop foreman-hooks

Fixes #37211 - Add ProxyPass for /images to support avatars

Fixes #37211

Add hiera data manager (HDM) plugin

Only install dnf module on EL8

We don't intend to use modularity on the initial release, so scope this
to only EL8.

Add hammer-cli-foreman-rh-cloud package

Include settings header via concat

Rather than including this directly via ERB (which raises a deprecation
warning), this uses more native methods.

require puppetlabs/stdlib 9.x

The `ensure_packages()` function is deprecated. The successor is
`stdlib::ensure_packages().

Fixes #36090 - Support REX cockpit removal

This doesn't deal with the database, but cockpit is a special plugin in
that it's a subpackage of the regular Remote Execution plugin.

By default it uses undef so you can still set the version globally as
well.

Refs #36090 - Support plugins are absent

This makes it possible to remove plugins, even though we don't deal with
the database.

Fixes #36801: Make Redis the default cache type