[PWGDQ] refactoring of some matching QA member functions

[aferrero2707]

The refactoring removes some unneeded retrieval of track references from the input tables.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 0 warnings, 🔕 7 disabled

[alibuild]

Error while checking build/O2Physics/staging for 051f3a1 at 2026-06-17 11:15:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGDQ/Tasks/qaMatching.cxx:2658:73: error: 'muonTrack1' was not declared in this scope; did you mean 'muonTracks'?
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGDQ/Tasks/qaMatching.cxx:2659:73: error: 'muonTrack2' was not declared in this scope; did you mean 'muonTracks'?
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for 051f3a1 at 2026-06-17 11:20:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGDQ/Tasks/qaMatching.cxx:2658:73: error: 'muonTrack1' was not declared in this scope; did you mean 'muonTracks'?
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGDQ/Tasks/qaMatching.cxx:2659:73: error: 'muonTrack2' was not declared in this scope; did you mean 'muonTracks'?
ninja: build stopped: subcommand failed.

Full log here.

[aferrero2707]

The build failure was due to the parallel merging of another PR, I have rebased the code once more now that no additional PRs are pending.