Implement removal of the Agent via `state: present | absent` in the role

[mkllnk]

The README documents the uninstall process for Windows but not for any other platforms. I'm working on Debian/Ubuntu and I'm imagining the following tasks:

• Remove apt repository.
• Remove agent and its systemd service file.
• Remove user.
• Custom: Remove integrations.

It would be super handy if the role had state: present | absent on a global level to do these tasks automatically.

[bkabrda]

:wave: Hi, for instructions on manual uninstallation, you can consult the official docs.

I absolutely agree that it would be great to have state functionality on the role, however that's a larger piece of work and I can't promise a date when this would be implemented. I will leave this issue open and we'll provide update when we get to this.