[SCI-10009] smarten up unfinishedProcessingJobsExist and findExistingDataCollection
[SCI-10009] smarten up unfinishedProcessingJobsExist and findExistingDataCollection

DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb