Better ghes support

[MonolithProjects]

Pull Request Template

Description

Because of different service names for GH Actions Runner running against github.com and GitHub Enterprise Sever (service_name: actions.runner.{{ runner_name }}.service vs service_name: actions.runner._services.{{ runner_name }}.service ) GHES users had to use service_name variable to get their runner service name built correctly. This option was not clear enough and caused confusion.
This PR will deprecate service_name in favor of runner_on_ghes boolean variable. Now the users only need to set if the runner will run on GHES or not and the service name will be crated correctly.

I am keeping also backward compatibility.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Was not tested on GHES.

Destination branch

Create a PR into develop branch