[PWGJE] Adding reflection signal from MC and updating jet matching process

[Rajdeep-nandi]

This pull request includes :

1. Adding the reflection template
2. Adding Angularity in the sparse histogram
3. Modified the matching process function

[vkucera]

@Rajdeep-nandi The PR title is too vague. Please add info about the location.

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for 80065c8 at 2026-09-04 12:32:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 5 errors and 6 warnings.'
Found 5 errors and 6 warnings.
++ [[ 5 -gt 0 ]]
++ cat /sw/BUILD/1bb08e8f5ef53ba6f3255545f1e0f16fdc4f36a5/O2Physics-code-check/errors.txt
PWGJE/Tasks/jetHFAngularity.cxx:21:1: error: included header JetSubstructure.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetHFAngularity.cxx:51:11: error: no header providing "int8_t" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetHFAngularity.cxx:52:18: error: unused variable 'kCandSelFlagD0bar' [clang-diagnostic-unused-const-variable,-warnings-as-errors]
PWGJE/Tasks/jetHFAngularity.cxx:257:3: error: no header providing "o2::framework::Produces" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGJE/Tasks/jetHFAngularity.cxx:611:14: error: variable 'm' is not initialized [cppcoreguidelines-init-variables,-warnings-as-errors]
++ [[ 6 -gt 0 ]]
++ cat /sw/BUILD/1bb08e8f5ef53ba6f3255545f1e0f16fdc4f36a5/O2Physics-code-check/warnings.txt
PWGJE/Tasks/jetHFAngularity.cxx:1019:15: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
PWGJE/Tasks/jetHFAngularity.cxx:1065:21: warning: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty]
PWGJE/Tasks/jetHFAngularity.cxx:1107:17: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
PWGJE/Tasks/jetHFAngularity.cxx:1108:17: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
PWGJE/Tasks/jetHFAngularity.cxx:1109:17: warning: use auto when initializing with a cast to avoid duplicating the type name [modernize-use-auto]
PWGJE/Tasks/jetHFAngularity.cxx:1216:13: warning: boolean expression can be simplified by DeMorgan's theorem [readability-simplify-boolean-expr]
++ [[ 5 -gt 0 ]]
++ exit 1
--

Full log here.