Cleanup of track container filing code in ProtoTrackCreationAndFitAlg + test improvs
This is a follow up of: !68479 (closed) While working on the issue related to the last ACTS bump I have seen opportunity to simplificationof track container use and also simplifications to the test scirpt (i.e. I need to hack it like in this changeset to enable debugger).
Basically, in the flags system was designed so that in most cases we should not need additional python parsers.