Do not reinstall the runner on updates

What does this MR do?

Do not reinstall the service, fix #2422

Why was this MR needed?

see #2422

Are there points in the code the reviewer needs to double check?

Not sure if it is smart to 2> /dev/null the install, this would suppress install errors. might replace with a grep -v Init already exists

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Tests
  • Added for this feature/bug - not feasible
  • All builds are passing
• Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

#2422

Do I have to add a test for this? There do not seem to be package install tests yet. Would that be a new stage in the gitlab-ci.yml ??? Or can we go like that?

Does not yet work (manually tested) because in the prerm it's still uninstalling (does not seem to be the case for .rpm). Now it should work... But only on the update after the next one, because the pre-rm of the old package will be called on upgrades.

The new push was successfully tested for Ubuntu.

marked the checklist item All builds are passing as completed

marked the checklist item Branch has no merge conflicts with master (if you do - rebase it please) as completed

changed the description

mentioned in merge request !614

mentioned in issue #2422

marked the checklist item Documentation created/updated as completed

please merge :-)