docs: describe how to deploy systemd templates

Co-authored-by: Steve Traylen <steve.traylen@cern.ch>

I've bent over backwards to make this work, while the solution is much
simpler than I thought it was.

Closes: #510
Replaces: #511

Release 8.1.0

Add Missing Condition Units which were added in version244

Add a few more missing service options

Release 8.0.0

Correct UMask in mkswap example

Without a correct UMask set the `mkswap` example fails due
to permissions being too relaxed.

Support management of Swap unit files

Traditionally the `Install` section is always last
in a unit file.

Let `.swap` unit files be managed with `systemd::manage_dropin`
and `systemd::manage_unit`.

For example:

```puppet
systemd::manage_unit{'swapfile.swap':
  ensure        => 'present',
  active        => true,
  enable        => true,
  unit_entry    => {
    'Description' => 'Enable a swapfile at /swapfile',
  }
  swap_entry    => {
    'What' => '/swapfile',
  }
  install_entry => {
    'WantedBy' => 'multi-user.target',
  },
}
```

* https://www.freedesktop.org/software/systemd/man/latest/systemd.swap.html

Drop EOL RHEL, CentOS, Fedora, VirtuozzoLinux versions

* VirtuozzoLinux 7
* Fedora 38, 39
* Centos 7, 8
* RHEL 7

* [Systemd::Unit::Service] add support for LogRateLimit* options

* fix order

Add Ubuntu 24.04 and Fedora 40 support

add support for journal upload and remote server

Reason: equal options in journal-upload and journal-remote

Manage {system,user}.conf values

dropin_file_spec: fix typo

modulesync 9.3.0

modulesync 9.2.0

Support Mount units for manage_unit or dropin types

Support addition `.mount` units in `systemd::manage_unit`
and `systemd::manage_type`.

e.g.

```puppet
systemd::manage_unit { 'var-lib-sss-db.mount':
  ensure      => $_use_ramdisk,
  unit_entry  => {
    'Description' => 'Mount a ram disk for sssd to use',
  },
  mount_entry => {
    'What'    => 'tmpfs',
    'Where'   => '/var/lib/sss/db',
    'Type'    => 'tmpfs',
    'Options' => "size=${ramdisk}M,mode=0700,uid=sssd,gid=sssd,rootcontext=system_u:object_r:sssd_var_lib_t:s0",
  },
}
```

* https://www.freedesktop.org/software/systemd/man/latest/systemd.mount.html