The way we parse runner parameters is becoming hard to maintain and extend. Some refactoring required.

Review on PR #1374

I think it might be better when working with these command to use a string array and then join then with a space. Rather than having to worry about spaces in all the strings etc.

runnerServiceConfig could be defined as a string array above and you can merge the arrays and join.

Originally posted by @ScottGuymer in https://github.com/philips-labs/terraform-aws-github-runner/pull/1374#discussion_r768531638