Add AccumulatorCache to FTF config

Cache FTF configuration, since it's usually very similar.

Investigation for timeouts in ATR-26787

Trigger/TrigAlgorithms/TrigFastTrackFinder/python/TrigFastTrackFinderConfig.py

 # Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
 
 from AthenaMonitoringKernel.GenericMonitoringTool import GenericMonitoringTool
+from AthenaConfiguration.AccumulatorCache import AccumulatorCache
 
 def TrigFastTrackFinderMonitoring(flags):
     name =    flags.Tracking.ActiveConfig.name
@@ -245,6 +246,7 @@ def TrigZFinderCfg(flags : AthConfigFlags, numberingTool) -> ComponentAccumulato
   return acc
 
 
+@AccumulatorCache
 def TrigFastTrackFinderCfg(flags: AthConfigFlags, name: str, slice_name: str, RoIs: str, inputTracksName:str = None) -> ComponentAccumulator:
   acc = ComponentAccumulator()