Change for Trigger test ART test - Bphysics slice test

Add "SkipEvents=3" to ensure we get counts

Trigger/TrigValidation/TriggerTest/test/test_slice_bphysics_build.sh

@@ -26,6 +26,7 @@ export SLICE="bphysics"
 export INPUT="bphysics"
 export EVENTS="10"
 export COST_MONITORING="False"
+export EXTRA="jp.AthenaCommonFlags.SkipEvents.set_Value_and_Lock(3);"
 
 source exec_athena_art_trigger_validation.sh
 source exec_art_triggertest_post.sh