[QEE] ew_projects_Run3 : DecayTreeFitter to help Tracking Efficiencies

Supersedes TurCal tuples of !1781 (merged) and !1718 (merged) (MagDown and MagUp 24c3 data-taking).

Adds an AllPVs DecayTreeFitter, and the following DTF variables:

    for muon in trkeff_probes:
        v[muon] = _dtf_FC({
            "P": F.P,
            "PERR2": F.PERR2(),
        })
    v["Z0"] = _dtf_FC({
        "MASS": F.MASS,
        "CHI2DOF": F.VALUE_OR(-999) @ F.CHI2DOF,
    })

ToDo

• Review from @/rjhunter