[PWGEM] Fix clang-tidy warnings and errors in EMCal cuts related files

[mhemmer-cern]

• Fix clang-tidy warnings and errors in EMCal cuts related files.
• Add emcal qc histogram to have cluster track matching as function of track pT

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 35 warnings, 🔕 0 disabled

[alibuild]

Auto-approving on behalf of @mhemmer-cern.

[alibuild]

Error while checking build/O2Physics/code-check for 7127443 at 2026-07-13 19:27:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 2 errors and 0 warnings.'
Found 2 errors and 0 warnings.
++ [[ 2 -gt 0 ]]
++ cat /sw/BUILD/1715807d5d0173e5362226f4854743b0667f6232/O2Physics-code-check/errors.txt
PWGEM/PhotonMeson/Core/EMCPhotonCut.cxx:24:6: error: no header providing "std::array" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGEM/PhotonMeson/Core/EMCPhotonCut.cxx:24:42: error: no header providing "std::size_t" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 2 -gt 0 ]]
++ exit 1
--

Full log here.