Remove instances job

This MR adds support for terminating machines with a generic job.

It also add some changes introduced in !180 (merged)

A trade-off has been made in order to adapt better to the termination request dto:

• Instead of just providing instances ids, filters can be passed to the TerminateMachinesInput in order to get the list of machines that match those filters and therefore kill them.
• Both operations can be executed in the same method.
• If no instances neither filters are passed, the Terminate method fails.