Update SGInputLoader.cxx - promote transient providerless loads of objects to being an error

Will Buttingerrequested to merge
will-24.0-patch-68662 into 24.0

Update SGInputLoader.cxx - promote transient providerless loads of objects to an error, as usually indicative of missing output declaration

Decorations are just a warning for now, because there are too many missing decoration declarations to fix.

Edited by Will Buttinger

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