[PWGHF] Update of B+ routines

[apalasciano]

Features introduced in B0 workflow by @fchinu with P.R.: #17532, #17643, #17669 ported here for B+:

• extension of D variables to B+ reduced task and MLResponse
• trigger mass cuts in the selector
• extension of process functions in the taskBplusReduced.cxx in view of Pb--Pb analysis

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 4 warnings, 🔕 3 disabled