[PWGJE] Add MC matching flag to Ds-jet efficiency

[monamelop]

This allows truth-matched reconstructed Ds candidates to be selected when evaluating the Ds-tagged jet efficiency.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for 62e852a at 2026-09-02 13:37:

## 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/88e373fef6d8ac92c7e9c5cd02e127b2dde8a2d1/O2Physics-code-check/errors.txt
PWGJE/Tasks/jetDsSpecSubs.cxx:180:3: error: no header providing "o2::framework::Produces" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:203:99: error: no header providing "o2::aod::jmccollisionlb::mcCollisionId" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 2 -gt 0 ]]
++ exit 1
--

Full log here.