adding QueueBuildJob() that queues a job even if it is currently running

[KokeClassic]

Useful for jobs that take parameters. ie. we have a job that takes the parameters artifact name and version that then promotes that artifact to our testing and release servers.

[sven7777]

Would love to see this get merged. Helps tremendously with queue'ing up multiple jobs. We have been using this via a forked version but would be better if it was in main repo.