[PWGDQ] Add globalBc to DQ MC data model for MC truth BC checks

[sigurdnese]

• Add globalBc to reducedMcEvents, in order to calculate MC truth TF and ITSROF border checks
• New column is filled in tableMakerMc(_withAssoc), passing the globalBc from central data model McCollisions
• Add converter to fill 'globalBc' column with dummy 0
• Implement calculation of MC IsTFBorder and IsITSROFBorder variables in the VarManager
• New helper function to set TF border calculation configurables and metadata
• The TF border calculation ('recomputed') is also implemented for the real data case, akin to the existing ITSROFBorderRecomputed variable. The initialization of metadata and configurables are added to tableReader_withAssoc
• All TFBorder and ITSROFBorder variables given names and units in the VarManager
• The asymmetric-pairing task in MC (used for the UPC D0 analysis) also gets access to the MC TFBorder and ITSROFBorder calculations, by fetching the configurables from analysis-event-selection

https://indico.cern.ch/event/1688270/#11-update-of-the-reducedmceven

[github-actions]

O2 linter results: ❌ 1039 errors, ⚠️ 947 warnings, 🔕 0 disabled

[vkucera]

This is not a task. This is a table producer.

[alibuild]

Error while checking build/O2Physics/o2 for 84e1ee3 at 2026-05-26 17:18:

## sw/BUILD/O2Physics-latest/log
CMake Error at cmake/O2PhysicsAddExecutable.cmake:113 (add_executable):
CMake Error at cmake/O2PhysicsAddExecutable.cmake:113 (add_executable):
ninja: error: rebuilding 'build.ninja': subcommand failed

Full log here.