Add migration option to the unattended script

[davidfmiranda]

Hello team!

The aim of this issue is to add an option to migrate from Elastic Stack basic license to ODFE.

The script must follow these steps:

• Check if any of the Elastic Stack components are present on the system. If so, check if they are under Elasticsearch basic license.
• Check if the installed version is compatible with the latest ODFE version.
• Create snapshots of all the user data.
• Uninstall the basic license present components.
• Install the ODFE components.
• Restore the snapshots.

Regards,

David