[ALICE3] Add procces function to onTheFlyTracker.cxx for mcParticle with daughters

[jesgum]

@njacazio to ensure not to break any of the current behaviour, I have temporarily added a new process function to the tracker that processes the new mcParticle table that is produced by the recently added decayer.

Smearing is done with both luts and the fasttracker based on if the particle is a primary or if it came from the decayer. All tracks are then added to the same track table (not sure if it make sense to make a separate table for the secondaries). Then we would have to have a new task that processes the tracks table that can do proper v0 and cascade finding with the combinatorics

Tagging @lhusova

[github-actions]

O2 linter results: ❌ 42 errors, ⚠️ 24 warnings, 🔕 0 disabled

[lhusova]

Thanks @jesgum. Creating a separate table for secondaries is not good, the V0 finder is in place and it loops over all particles, where in one table are both primaries and secondaries.
From my point of view, it is good to have two separate process functions, at least for now.

[jesgum]

Ok good, then we can keep it like this for now (the current iteration does all tracks in the same table so it should be OK). Thanks a lot for the feedback @lhusova!

[alibuild]

Error while checking build/O2Physics/o2 for b4970cd at 2026-01-17 11:43:

[1527/2861] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-dstar-mcp-charged
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[1576/2861] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-vertexqa.dir/vertexQA.cxx.o

Full log here.