23.0-coverity-MuonTesterTre

solve coverity defects introduced recently(May-July 2023): include header recursion, unchecked return value

MuonSpectrometer/MuonValidation/MuonTesterTree/MuonTesterTree/EventInfoBranch.h

@@ -8,6 +8,7 @@
 #include <StoreGate/ReadDecorHandleKey.h>
 #include <xAODEventInfo/EventInfo.h>
 #include <MuonTesterTree/MuonTesterBranch.h>
+#include <MuonTesterTree/MuonTesterTree.h>
 #include <atomic>
 
 namespace MuonVal {