Add refreshonly option

[vcerenu]

This PR adds refreshonly option for apt update command because the command execution should only be executed when changes have been made to the repository configuration files, in order to maintain the idempotence of the class.

The command's operation was tested before and after the class execution to verify its operation.

Before the change:

root@master1:~# puppet agent -t
Info: Using environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Notice: Requesting catalog from puppet:8140 (127.0.2.1)
Notice: Catalog compiled by master1
Info: Caching catalog for master1
Info: Applying configuration version '1740415593'
Notice: /Stage[repo]/Wazuh::Repo/Exec[apt-update]/returns: executed successfully (corrective)
Notice: Applied catalog in 3.58 seconds
root@master1:~#

After the change:

root@master1:~# puppet agent -t
Info: Using environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Notice: Requesting catalog from puppet:8140 (127.0.2.1)
Notice: Catalog compiled by master1
Info: Caching catalog for master1
Info: Applying configuration version '1740415702'
Notice: Applied catalog in 4.50 seconds
root@master1:~#

[poloz-lab]

It's a little bit weird because nothing refreshes this Exec resource.

I would suggest to add a notify at least in the apt::source