[PWGLF] Update forwardlambdakzeroanalysis

[romainschotter]

• add new QA histograms
• fix the V0 Z cut
• address some of the cpp code-check errors

[github-actions]

O2 linter results: ❌ 12 errors, ⚠️ 17 warnings, 🔕 0 disabled

[alibuild]

Auto-approving on behalf of @romainschotter.

[alibuild]

Error while checking build/O2Physics/code-check for ed55bc2 at 2026-08-30 22:39:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 3 errors and 71 warnings.'
Found 3 errors and 71 warnings.
++ [[ 3 -gt 0 ]]
++ cat /sw/BUILD/26be1d42c3452bbf42a07ae65b0d9e266d32da8e/O2Physics-code-check/errors.txt
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:91:9: error: function-like macro 'BITSET' used; consider a 'constexpr' template function [cppcoreguidelines-macro-usage,-warnings-as-errors]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:92:9: error: function-like macro 'BITCHECK' used; consider a 'constexpr' template function [cppcoreguidelines-macro-usage,-warnings-as-errors]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:188:67: error: do not implicitly decay an array into a pointer; consider using gsl::array_view or an explicit cast instead [cppcoreguidelines-pro-bounds-array-to-pointer-decay,-warnings-as-errors]
++ [[ 71 -gt 0 ]]
++ cat /sw/BUILD/26be1d42c3452bbf42a07ae65b0d9e266d32da8e/O2Physics-code-check/warnings.txt
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:159:20: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:380:5: warning: function 'positivePt' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:381:5: warning: function 'negativePt' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:382:5: warning: function 'positivePz' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:383:5: warning: function 'negativePz' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:384:5: warning: function 'positivePtMc' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:385:5: warning: function 'negativePtMc' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:386:5: warning: function 'positivePzMc' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:387:5: warning: function 'negativePzMc' should be marked [[nodiscard]] [modernize-use-nodiscard]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:722:24: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:724:23: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:726:27: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:728:19: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:730:23: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1353:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1358:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1363:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1368:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1373:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1487:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1489:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1491:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1493:13: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1554:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1556:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1558:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1560:13: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1620:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1622:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1624:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1626:13: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1686:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1688:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1690:31: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1692:13: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1752:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Strangeness/forwardlambdakzeroanalysis.cxx:1754:31: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.

[vkucera]

@romainschotter Please use a more informative PR title.