[PWGJE] Add MC efficiency histograms for Ds-jet analysis

[monamelop]

This PR adds new histograms for MC efficiency studies in the Ds-tagged jet analysis.

Changes

• add detector-level and particle-level histograms
• add THnSparse objects for MC studies
• store jet and Ds kinematic variables

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 13 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/o2 for d1bb093 at 2026-07-08 00:02:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGJE/Tasks/jetDsSpecSubs.cxx:407:61: error: unused parameter 'particles' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/staging for ed766f9 at 2026-07-08 00:06:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGJE/Tasks/jetDsSpecSubs.cxx:403:61: error: unused parameter 'particles' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for ed766f9 at 2026-07-08 00:07:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/PWGJE/Tasks/jetDsSpecSubs.cxx:403:61: error: unused parameter 'particles' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/code-check for ed766f9 at 2026-07-08 01:53:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 9 errors and 0 warnings.'
Found 9 errors and 0 warnings.
++ [[ 9 -gt 0 ]]
++ cat /sw/BUILD/d9bb009c572db898b2773f3e712bab20b079f281/O2Physics-code-check/errors.txt
PWGJE/Tasks/jetDsSpecSubs.cxx:16:1: error: included header DecayChannels.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:17:1: error: included header CandidateReconstructionTables.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:18:1: error: included header CandidateSelectionTables.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:23:1: error: included header JetSubstructure.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:26:1: error: included header TrackSelectionTables.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:33:1: error: included header DataProcessorSpec.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:210:40: error: no header providing "THnSparse" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:403:61: error: parameter 'particles' is unused [misc-unused-parameters,-warnings-as-errors]
PWGJE/Tasks/jetDsSpecSubs.cxx:403:61: error: unused parameter 'particles' [clang-diagnostic-unused-parameter,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 9 -gt 0 ]]
++ exit 1
--

Full log here.