Update SGInputLoader.cxx - access to auxvariables of extraoutput-declared...

Will Buttingerrequested to merge
will-24.0-patch-55750 into 24.0

Update SGInputLoader.cxx - access to auxvariables of extraoutput-declared objects/containers via decorhandles should not trigger warnings - we will instead assume the requested variable is available.

This issue is discussed in https://its.cern.ch/jira/browse/ATR-30830 (analysis log files producing warnings about EventInfo.eventNumber access, which should be perfectly valid

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