[FOCAL-55] Open the detector in the middle in x

[hahassan7]

A new parameter has been added to split the detector open in x direction. Need for the irradiation tests.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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[alibuild]

Error while checking build/O2/fullCI_slc9 for 0995936 at 2025-05-04 02:24:

++ cp /sw/slc9_x86-64/O2/14232-slc9_x86-64-local1/compile_commands.json .
+++ python3 -c 'import json, os; print(os.path.commonprefix([x["file"] for x in json.loads(open("compile_commands.json").read()) if "sw/BUILD" not in x["file"] and "G__" not in x["file"] and x["file"].endswith(".cxx")]))'
++ O2_SRC=/sw/SOURCES/O2/14232-slc9_x86-64/0/
++ [[ -e /sw/SOURCES/O2/14232-slc9_x86-64/0//CMakeLists.txt ]]

Full log here.