Add ForwardElectrons to HION4

Desirable for light by light analysis, number of forward and central electrons on same order.

cc, @christos @igrabows

This merge request affects 1 package:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkHI

This merge request affects 1 file:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkHI/python/ListSlimming.py

Adding @jcatmore ,@emmat as watchers

added Derivation main review-pending-level-1 labels

CI Result SUCCESS (hash 513cba33)

	Athena
externals
cmake
make
tests

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changed title from Add ForwardElectrons to allVariables collection. to Add ForwardElectrons to allVariables HION4

changed title from Add ForwardElectrons to allVariables HION4 to Add ForwardElectrons to HION4

Changes are fine and CI succeeds, approving for L1. -L1

added review-approved label and removed review-pending-level-1 label

mentioned in commit 63abf2b3

merged