[PWGJE] Add new function and histograms to check number of tracks according to their MC associations

[y-song]

New function processQcCheck duplicates processEFfiencyPurity with additional histograms for checking number of tracks per event according to their MC associations

[github-actions]

O2 linter results: ❌ 1 errors, ⚠️ 5 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for be2e37d at 2026-09-05 07:28:

## sw/BUILD/O2-latest/log
2026-09-05T06:14:47.682+0200 [68751:140522653961856] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame]
2026-09-05T06:14:47.682+0200 [68751:140522653961856] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame
2026-09-05T06:14:47.816+0200 [68730:140296450670208] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame]
2026-09-05T06:14:47.816+0200 [68730:140296450670208] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame


## sw/BUILD/O2Physics-latest/log
2026-09-05T06:33:52.723+0200 [14116:140309789281920] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame]
2026-09-05T06:33:52.723+0200 [14116:140309789281920] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame
2026-09-05T06:33:52.649+0200 [14074:140094693236352] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame]
2026-09-05T06:33:52.649+0200 [14074:140094693236352] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8980": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8980: connection attempt timed out before receiving SETTINGS frame


## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 3 errors and 1 warnings.'
Found 3 errors and 1 warnings.
++ [[ 3 -gt 0 ]]
++ cat /sw/BUILD/a240bbcafc3dd279a00e192733df3418f02d1a35/O2Physics-code-check/errors.txt
PWGJE/Tasks/trackEfficiency.cxx:47:8: error: constructor does not initialize these fields: pdg [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGJE/Tasks/trackEfficiency.cxx:176:139: error: the parameter 'tracks' is copied for each invocation but only used as a const reference; consider making it a const reference [performance-unnecessary-value-param,-warnings-as-errors]
PWGJE/Tasks/trackEfficiency.cxx:1493:52: error: no header providing "kPDecay" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/a240bbcafc3dd279a00e192733df3418f02d1a35/O2Physics-code-check/warnings.txt
PWGJE/Tasks/trackEfficiency.cxx:201:9: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
++ [[ 3 -gt 0 ]]
++ exit 1
--

Full log here.