[PWGCF] Simplify QVector table calculation and fix fetching data from CCDB related bugs

[meiALICE]

Simplify QVector table calculation.

Fix a bug where fetching data from CCDB is unstable.

Simplify technical cuts.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for 82f7980 at 2026-10-14 20:18:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for 82f7980 at 2026-10-14 20:19:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/code-check for da8260e at 2026-10-16 00:49:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'To reproduce the results below locally, run: '\''aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'\''.'
To reproduce the results below locally, run: 'aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'.
++ echo 'To apply all automatic fixes, add the '\''-e O2PHYSICS_CHECKER_FIX=1'\'' option.'
To apply all automatic fixes, add the '-e O2PHYSICS_CHECKER_FIX=1' option.
++ echo 'See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.'
See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.
++ echo 'Found 1 errors and 1 warnings.'
Found 1 errors and 1 warnings.
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/f0c59457e3b880e18742e1d67ee4ce540566340b/O2Physics-code-check/errors.txt
PWGCF/MultiparticleCorrelations/Tasks/multiparticleCorrelationsMei.cxx:51:1: error: included header cstdint is not used directly [misc-include-cleaner,-warnings-as-errors]
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/f0c59457e3b880e18742e1d67ee4ce540566340b/O2Physics-code-check/warnings.txt
PWGCF/MultiparticleCorrelations/Tasks/multiparticleCorrelationsMei.cxx:330:13: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
++ [[ 1 -gt 0 ]]
++ exit 1
--

Full log here.