[PWGHF] Add single-track selection on D0 for D*

[Marcellocosti]

Needed in case one wants to reapply skimming selections on D* candidates

[github-actions]

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

[alibuild]

Error while checking build/O2Physics/code-check for ee42a33 at 2026-08-27 14:56:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 4 errors and 1 warnings.'
Found 4 errors and 1 warnings.
++ [[ 4 -gt 0 ]]
++ cat /sw/BUILD/25117d51409faa7d226968aa13831f7021af0b99/O2Physics-code-check/errors.txt
PWGHF/TableProducer/candidateSelectorDstarToD0Pi.cxx:62:56: 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]
PWGHF/TableProducer/candidateSelectorDstarToD0Pi.cxx:70:62: 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]
PWGHF/TableProducer/candidateSelectorDstarToD0Pi.cxx:73:74: 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]
PWGHF/TableProducer/candidateSelectorDstarToD0Pi.cxx:102:56: 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]
++ [[ 1 -gt 0 ]]
++ cat /sw/BUILD/25117d51409faa7d226968aa13831f7021af0b99/O2Physics-code-check/warnings.txt
PWGHF/TableProducer/candidateSelectorDstarToD0Pi.cxx:143:7: warning: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays]
++ [[ 4 -gt 0 ]]
++ exit 1
--

Full log here.