[PWGJE] Updated GNN b-jet analysis tasks

[choich08365]

PWGJE/Tasks/bjetTaggingGnn.cxx

• Refactored process functions using templates.
• Updated processes for UE subtraction and SV mass template fit.
• Applied event selection flags for OO collisions.

PWGJE/Tasks/bjetTreeCreator.cxx

• Minor revisions: comments for future discussion on using PID info for training the GNN model, track DCA selection criteria matched to main analysis task.

[github-actions]

O2 linter results: ❌ 56 errors, ⚠️ 13 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 07ae072 at 2026-08-20 07:41:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 9 errors and 21 warnings.'
Found 9 errors and 21 warnings.
++ [[ 9 -gt 0 ]]
++ cat /sw/BUILD/a6cccc0d80164103059dfd8d0339b8945edee378/O2Physics-code-check/errors.txt
PWGJE/Tasks/bjetTaggingGnn.cxx:50:1: error: included header type_traits is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:166:31: error: no header providing "TAxis" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:178:8: error: constructor does not initialize these fields: pdg, ccdb [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:632:85: error: no header providing "o2::aod::BkgChargedRhos" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:660:92: error: no header providing "o2::aod::BkgChargedMcRhos" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:700:15: error: member 'largeNegativeNumber' of type 'const float' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:701:15: error: member 'largePositiveNumber' of type 'const float' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:1084:13: error: member 'nPartInel0' of type 'const int' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/bjetTaggingGnn.cxx:1456:14: error: variable 'jetFlavor' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
++ [[ 21 -gt 0 ]]
++ cat /sw/BUILD/a6cccc0d80164103059dfd8d0339b8945edee378/O2Physics-code-check/warnings.txt
PWGJE/Tasks/bjetTaggingGnn.cxx:55:10: warning: inclusion of deprecated C++ header 'math.h'; consider using 'cmath' instead [modernize-deprecated-headers]
PWGJE/Tasks/bjetTaggingGnn.cxx:145:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:146:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:147:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:148:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:149:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:150:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:151:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:152:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:153:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:154:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:155:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:156:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:157:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:158:54: warning: use designated initializer list to initialize 'EvtSelStage' [modernize-use-designated-initializers]
PWGJE/Tasks/bjetTaggingGnn.cxx:1089:43: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/bjetTaggingGnn.cxx:1094:46: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/bjetTaggingGnn.cxx:1533:34: warning: use 'contains' to check for membership [readability-container-contains]
PWGJE/Tasks/bjetTaggingGnn.cxx:1545:34: warning: use 'contains' to check for membership [readability-container-contains]
PWGJE/Tasks/bjetTreeCreator.cxx:52:10: warning: inclusion of deprecated C++ header 'math.h'; consider using 'cmath' instead [modernize-deprecated-headers]
PWGJE/Tasks/bjetTreeCreator.cxx:814:9: warning: implicit conversion 'int' -> 'bool' [readability-implicit-bool-conversion]
++ [[ 9 -gt 0 ]]
++ exit 1
--

Full log here.