Allow INTERFACE_SOURCES to specify $<TARGET_OBJECTS> (#14970)
Fix cmTarget::GetSourceFiles to set EvaluateForBuildsystem on the $<TARGET_PROPERTY:...,INTERFACE_SOURCES> generator expression so that the $<TARGET_OBJECTS> generator expression is allowed within an INTERFACE_SOURCES value. Extend the InterfaceLibrary test to cover this case. Extend the RunCMake.TargetObjects test to cover failure of $<TARGET_OBJECTS> when used through $<TARGET_PROPERTY:...,INTERFACE_SOURCES> in a non-buildsystem context.
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