SVertexer: add V0 Photontune

[f3sch]

pingin @shahor02

[shahor02]

Looks good (still to be clarified if we exclude all tracks w/o ITS from anything but photons), removing draft tag.
Would be good do get timing with this version.

[f3sch]

I checked that now that when one uses svertexer.mExcludeTPCtracks=true and set TPC as vertexing-source as is needed by the cascade-finder the. One gets the exact same output as with the dev branch and this PR
I checked this by dumping the indices with root -b -q -l -e 'TTree *t; (TFile::Open("o2_secondary_vertex.root"))->GetObject("o2sim", t); t->SetScanField(0); t->Scan("*");' > scanBase.out.txt for both branches and compared the hash of the output file, which are the same, and I plotted the v0,cascade,3body radius when one creates the full kinematics, e.g., svertexer.createFullV0s=true.

So this PR will reproduce the old behaviour and not interfere if svertexer.mExcludeTPCtracks=true is set. Of course this tuning will only affect tpc-only tracks, so if svertexer.mExcludeTPCtracks=false, there will only be V0s produced on top of the V0s one from the dev branch (with the reduced photon mass-width, which is validated at 100 MeV to be fully sufficient), and the cascades/3body are not touched at all meaning the all the ones found with the current dev branch will be found, no more no less.

[alibuild]

Error while checking build/O2/fullCI for 77d0643 at 2023-11-30 20:47:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/O2Physics-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/QualityControl-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/O2-full-system-test-latest/log
Detected critical problem in logfile reco_ASYNC.log
[73804:internal-dpl-ccdb-backend]: [19:46:55][ERROR] CcdbDownloader finished transfer http://alice-ccdb.cern.ch/GLO/Config/SVertexerParam for 1550600800000 (agent_id: alissandra02-1701373601-EjSmcg) with http code: 404
[73804:internal-dpl-ccdb-backend]: [19:46:55][ERROR] File GLO/Config/SVertexerParam could not be retrieved. No more hosts to try.
[73812:ctp-entropy-decoder]: [19:46:55][ERROR] LM:202 L0:0 L1:1 TwI:3 Trigger classes wo input:166
[ERROR] pid 73853 (secondary-vertexing) crashed with or was killed with exit code 1
[ERROR]  - Device secondary-vertexing: pid 73853 (exit 1)
[ERROR] SEVERE: Device secondary-vertexing (73853) returned with 1


## 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/d0fd8663a2a1df8ca41d21cd4389e7245bb576a9/slc8_x86-64/o2checkcode/1.0-local177/etc/modulefiles
++ cat
--

Full log here.

[shahor02]

CI failures unrelated, relevant fullCI passed, merging.