Unit test for DriveHandler and CleanerSession

I started working on a unit test which would catch a regression related to https://gitlab.cern.ch/cta/operations/-/issues/708

According to my plan, the test should:

1. Create a process manager
2. Add a drive handler to the process manager
3. Create a tape session reporter
4. Report session statuses via reporter like in normal workflow
5. At some point send the Fatal status
6. Run process manager: it starts a loop for receiving messages and lets the drive handler process them
7. Drive handler reacts to Fatal and terminates the session
8. Drive handler starts a cleaner session
9. Cleaner session finds VID and runs as it should
10. Send shutdown signal, kill gracefully the handler subprocesses and stop running the process manager