[PWGDQ] add some fgVarNamesMap related to A2 analysis

[ypwangg]

No description provided.

[github-actions]

O2 linter results: ❌ 6 errors, ⚠️ 18 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 0e5c388 at 2026-07-20 11:34:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 35 errors and 0 warnings.'
Found 35 errors and 0 warnings.
++ [[ 35 -gt 0 ]]
++ cat /sw/BUILD/cc0c8d671469544e30b547ee644d9898556c9d71/O2Physics-code-check/errors.txt
PWGDQ/Core/VarManager.cxx:47:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:48:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:50:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:56:1: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:80:28: error: initializer for base class 'TObject' is redundant [readability-redundant-member-init,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:134:14: 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]
PWGDQ/Core/VarManager.cxx:142:45: error: the parameter 'system' 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]
PWGDQ/Core/VarManager.cxx:195:43: error: result of integer division used in a floating point context; possible loss of precision [bugprone-integer-division,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:196:43: error: result of integer division used in a floating point context; possible loss of precision [bugprone-integer-division,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:238:45: error: the parameter 'kfp' 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]
PWGDQ/Core/VarManager.cxx:238:61: error: the parameter 'PV' 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]
PWGDQ/Core/VarManager.cxx:251:18: error: variable 'calibMean' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:251:29: error: variable 'calibSigma' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:274:27: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:275:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:295:5: error: do not use 'else' after 'return' [readability-else-after-return,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:297:18: error: variable 'calibMean' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:297:29: error: variable 'calibSigma' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:297:41: error: variable 'calibStatus' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:324:27: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:325:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:326:29: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:346:5: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:347:66: 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]
PWGDQ/Core/VarManager.cxx:348:48: 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]
PWGDQ/Core/VarManager.cxx:349:50: 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]
PWGDQ/Core/VarManager.cxx:369:7: error: switch has 2 consecutive identical branches [bugprone-branch-clone,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:403:14: 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]
PWGDQ/Core/VarManager.cxx:414:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:434:28: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:468:9: error: variable 'diff' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:468:15: error: variable 'diff2' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:615:9: error: variable 'diff' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:615:15: error: variable 'diff2' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
PWGDQ/Core/VarManager.cxx:615:22: error: variable 'binCenter' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
++ [[ 0 -gt 0 ]]
++ [[ 35 -gt 0 ]]
++ exit 1
--

Full log here.