[Strangeness Tracker] Use meaningful matching chi2 calculation

[fmazzasc]

@mpuccio

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[alibuild]

Error while checking build/O2/fullCI_slc9 for 14b497f at 2025-04-03 01:36:

## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:


## sw/BUILD/O2-full-system-test-latest/log
Detected critical problem in logfile reco_NOGPU.log
reco_NOGPU.log:[29964:internal-dpl-ccdb-backend]: [01:36:27][ERROR] Exception while running: Fatal error. Rethrowing.
reco_NOGPU.log-[29964:internal-dpl-ccdb-backend]: [01:36:27][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-itsmft-stf-decoder-workflow, device shutting down. Reason: Fatal error
[29964:internal-dpl-ccdb-backend]: [01:36:27][ERROR] CCDBDownloader CURL transfer error - Timeout was reached
[29964:internal-dpl-ccdb-backend]: [01:36:27][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/EMC/Calib/BadChannelMap for 1550600800000 (agent_id: alimetal01.cern.ch-1743636895-fZvPns) with http code: 0
[29964:internal-dpl-ccdb-backend]: [01:36:27][ERROR] File EMC/Calib/BadChannelMap could not be retrieved. No more hosts to try.
[29964:internal-dpl-ccdb-backend]: [01:36:27][FATAL] Unable to find CCDB object EMC/Calib/BadChannelMap/1550600800000
[29964:internal-dpl-ccdb-backend]: [01:36:27][ERROR] Exception while running: Fatal error. Rethrowing.
[29964:internal-dpl-ccdb-backend]: [01:36:27][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-itsmft-stf-decoder-workflow, device shutting down. Reason: Fatal error
[ERROR] Workflow crashed - PID 29964 (internal-dpl-ccdb-backend) did not exit correctly however it's not clear why. Exit code forced to 128.
[ERROR]  - Device internal-dpl-ccdb-backend: pid 29964 (exit 128)
[INFO]    - First error: [01:36:27][FATAL] Unable to find CCDB object EMC/Calib/BadChannelMap/1550600800000
[ERROR] SEVERE: Device internal-dpl-ccdb-backend (29964) had at least one message above severity 7: Unable to find CCDB object EMC/Calib/BadChannelMap/1550600800000


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/c374912da65ee26d6edf07e7c21d117c671ec920/slc9_x86-64/o2checkcode/1.0-local67/etc/modulefiles
++ cat
--

[0 more errors; see full log]

Full log here.

[mpuccio]

Looks good to me, @shahor02 can we merge this?