VP1AODSystems: Fix cppcheck 2.14 warnings.

Copying values in range-for. Prefer returning const references to members rather than copies.

Build area was cleaned as per request posted in the DB. The full software build will be performed

This merge request affects 1 package:

• graphics/VP1/VP1Systems/VP1AODSystems

This merge request affects 6 files:

• graphics/VP1/VP1Systems/VP1AODSystems/src/IParticleCollHandleBase.cxx
• graphics/VP1/VP1Systems/VP1AODSystems/src/IParticleCollHandleBase.h
• graphics/VP1/VP1Systems/VP1AODSystems/src/IParticleCollHandle_CaloCluster.cxx
• graphics/VP1/VP1Systems/VP1AODSystems/src/IParticleCollHandle_Jet.cxx
• graphics/VP1/VP1Systems/VP1AODSystems/src/MissingEtCollHandle.cxx
• graphics/VP1/VP1Systems/VP1AODSystems/src/VertexCollHandle.h

Adding @rbianchi as watcher

added EventDisplay JetEtmiss main review-pending-level-1 labels

CI Result SUCCESS (hash 200bcf9c)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 11369] (remote access info)

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

merged

mentioned in commit b3c6a27d