Adding doFastTracking configuration back into FTF ART tests

As title describes, flags.Tracking.doITkFastTracking=True is now added into the FastTrackFinder related ART tests within InDetPhysValMonitoring. This is due to a recent MR, which implemented a bugfix for when running the standard offline reconstruction when the fast tracking configuration is used (!62709 (merged)). This fix led to resolving efficiency losses seen for FTF when running FTF as an offline algorithm in the fast tracking configuration. Hence, this fast tracking configuration is added back into the FTF ART tests.

This MR only affects run 4 ART tests, so only master is targetted.