[PWGLF] New flattenicity analysis

[dushmanta97]

No description provided.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for b20654c at 2026-09-03 00:05:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 12 errors and 14 warnings.'
Found 12 errors and 14 warnings.
++ [[ 12 -gt 0 ]]
++ cat /sw/BUILD/79a8ac677cb23a2da04346e6dd307b010b86c057/O2Physics-code-check/errors.txt
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:27:1: error: included header TH1F.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:28:1: error: included header TH2F.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:29:1: error: included header TH3F.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:30:1: error: included header TMath.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:49:3: error: no header providing "o2::framework::Configurable" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:63:3: error: no header providing "o2::framework::HistogramRegistry" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:66:5: error: no header providing "o2::framework::OutputObjHandlingPolicy" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:143:13: error: no header providing "o2::framework::InitContext" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:145:5: error: no header providing "o2::framework::AxisSpec" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:153:18: error: no header providing "o2::framework::HistType" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:154:18: error: no header providing "TH1" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:154:23: error: no header providing "HIST" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 14 -gt 0 ]]
++ cat /sw/BUILD/79a8ac677cb23a2da04346e6dd307b010b86c057/O2Physics-code-check/warnings.txt
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:73:25: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:75:54: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:77:66: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:79:48: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:81:62: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:96:9: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:108:9: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:117:29: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:125:21: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:233:52: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:238:35: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:263:28: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:268:28: warning: statement should be inside braces [readability-braces-around-statements]
PWGLF/Tasks/Nuspex/flattenicityPtSpectra.cxx:282:31: warning: statement should be inside braces [readability-braces-around-statements]
++ [[ 12 -gt 0 ]]
++ exit 1
--

Full log here.