Reduce `MatchPredictionProcessingBatchSize` on LIVE-WMDA-ATLAS-FUNCTIONS

[zabeen]

• This may sufficiently improve match prediction queuing without need for further dev work.
• In UAT: determine what are typical total match prediction batch ("location") counts from large searches (may require extra A.I. logging)
• This will help decide a processing batch size that would allow small searches to enqueue their work items in the presence of other searches, whilst not significantly impeding the processing of large searches.