Drop kardianos/service dependency

[jnummelin]

We anyways already provide our own templates for system units and thus do not depend that much on the library functionality.

kardianos/service is not really maintained, there's e.g. a bug fix PR opened by myself on June 2023 which has not been merged.

I propose that we drop the whole dependency, use our own templates fully and provide needed wrappers around. We handle much of the same/similar logic in k0sctl/rig side already and thus known what needs to be done.

[kke]

• Detect init system (done in https://github.com/k0sproject/rig/tree/main/initsystem)
• Write out the template (they are already in go text/template format in k0s sources)
• Implement k0s start and k0s stop (also implemented in the same files in rig)

[github-actions]

The issue is marked as stale since no activity has been recorded in 30 days

[makhov]

We had a bug in the current implementation (here is the fix), so let's also add some unit tests to make sure, that the generated services are correct