Cancel cluster jobs on shutdown

[daniel-wer]

Description:

• Try to cancel the submitted cluster jobs when receiving the SIGINT signal so if the user decided to abort the execution
• Also don't interfere with the shutdown procedure of the main process by ignoring SIGTERM or calling sys.exit

Issues:

• contributes to https://github.com/scalableminds/voxelytics/issues/3127

Todos:

Make sure to delete unnecessary points or to check all before merging:

• [x] Updated Changelog