Add SysDecorationHandle to event and JVT algs

This is a follow-up of !23179 (merged) adding SysDecorationHandle support to the AsgEventScaleFactorAlg and JvtEfficiencyAlg.

The changes here are less trivial so some comments are needed (mainly for @krumnack):

• AsgEventScaleFactorAlg has two handles, one for input and one for output. They require different systematics to work as expected.
• AsgEventScaleFactorAlg drops the need to make a copy of the EventInfo, that's why I added PRW to tests as we need a copy made before so we can decorate it
• Some output in the tests is commented out until we resolve the issues with writing the output (will open a WIP MR tomorrow).