21.9: updating RD53B encoding tool to recognise new layer indices for ATLAS-P2-ITK-23 geometries

Self explanatory title. The tool is not running in production and the updates assure backward compatibility.

FYI: @nstyles @tlari @gcallea

This merge request affects 3 files:

• Simulation/Tools/RD53BEncoding/src/RD53BEncodingAlg.cxx
• Simulation/Tools/RD53BEncoding/src/RD53BEncodingTool.cxx
• Simulation/Tools/RD53BEncoding/src/RD53BEncodingTool.h

Adding @jchapman ,@vpascuzz as watchers

added 21.9 Simulation review-pending-level-1 labels

removed Simulation review-pending-level-1 labels

CI Result SUCCESS (hash 71eaf89f)

	Athena
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 45122]

added review-pending-level-1 label

I'm not sure why this didn't get the review-pending-level-1 label added automatically - doing it by hand (although I think the changes are uncontroversial).

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

merged

mentioned in commit eb8534ef

added sweep:ignore label