fix: migrate from JUGGLER_DETECTOR to simply DETECTOR

We have long wanted to move from JUGGLER_DETECTOR variables to simply DETECTOR. This achieves that, hopefully.

benchmarks/clustering/options/full_cal_reco.py

@@ -9,9 +9,9 @@ import ROOT
 from Configurables import ApplicationMgr, EICDataSvc, PodioInput, PodioOutput, GeoSvc
 from GaudiKernel.SystemOfUnits import MeV, GeV, mm, cm, mrad
 
-detector_name = str(os.environ.get("JUGGLER_DETECTOR", "athena"))
-detector_config = str(os.environ.get("JUGGLER_DETECTOR_CONFIG", detector_name))
-detector_version = str(os.environ.get("JUGGLER_DETECTOR_VERSION", "master"))
+detector_name = str(os.environ.get("DETECTOR", "athena"))
+detector_config = str(os.environ.get("DETECTOR_CONFIG", detector_name))
+detector_version = str(os.environ.get("DETECTOR_VERSION", "master"))
 
 detector_path = str(os.environ.get("DETECTOR_PATH", "."))
 compact_path = os.path.join(detector_path, detector_config)