[PWGCF] Add event shape processing in pair track track task

[ariedel-cern]

No description provided.

[github-actions]

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

[alibuild]

Auto-approving on behalf of @ariedel-cern.

[alibuild]

Error while checking build/O2Physics/code-check for 5b9b354 at 2026-09-08 11:22:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 1 errors and 0 warnings.'
Found 1 errors and 0 warnings.
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/d0b77cedbbcd7e7e7e32f54ec68b23cfa8c27b71/O2Physics-code-check/errors.txt
PWGCF/Femto/Core/pairBuilder.h:221:32: error: no header providing "o2::analysis::femto::utils::HasEventShape" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 1 -gt 0 ]]
++ exit 1
--

Full log here.