Turn off extra output

This adds a few quality of life changes:

• If the user sets the output level to WARNING or higher, disable the AppMgr spalsh screen
• Pass output level to AppMgr
• Don't produce a stack trace pointing back to the exception handler if it catches an exception

The last case was a bit weird so I moved it over to !66401 (merged).

Control/AthenaConfiguration/python/MainServicesConfig.py

 # Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
 from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
 from AthenaConfiguration.ComponentFactory import CompFactory
+from AthenaCommon.Constants import INFO
 
 
 def MainServicesMiniCfg(flags, loopMgr='AthenaEventLoopMgr', masterSequence='AthAlgSeq'):
@@ -267,6 +268,10 @@ def MainServicesCfg(flags, LoopMgr='AthenaEventLoopMgr'):
     cfg.setAppProperty('AuditAlgorithms', True)
     cfg.setAppProperty('InitializationLoopCheck', False)
     cfg.setAppProperty('EvtMax', flags.Exec.MaxEvents)
+    if flags.Exec.OutputLevel > INFO:
+        # this turns off the appMgr spalsh
+        cfg.setAppProperty('AppName', '')
+    cfg.setAppProperty('OutputLevel', flags.Exec.OutputLevel)
 
     if flags.Exec.DebugStage != "":
         cfg.setDebugStage(flags.Exec.DebugStage)