ISF_PunchThroughTools: Fix cppcheck 2.14 warnings.

Pass containers by const reference, not by value. Prefer returning const references to members rather than copies.

This merge request affects 1 package:

• Simulation/ISF/ISF_FastCaloSim/ISF_PunchThroughTools

This merge request affects 3 files:

• Simulation/ISF/ISF_FastCaloSim/ISF_PunchThroughTools/src/PDFcreator.h
• Simulation/ISF/ISF_FastCaloSim/ISF_PunchThroughTools/src/PunchThroughTool.cxx
• Simulation/ISF/ISF_FastCaloSim/ISF_PunchThroughTools/src/PunchThroughTool.h

Adding @zhangr ,@tadej ,@schaarsc ,@jbeirer ,@jchapman as watchers

added Simulation main review-pending-level-1 labels

CI Result SUCCESS (hash 6980aa62)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9662] (remote access info)

Straightforward modifications, approving --L1

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

merged

mentioned in commit de7b1692