Determination of the $1s2{\ell }2{{\ell }}^{\prime }$ state production ratios ${{}^{4}P}^{o}/{}^{2}P$, ${}^{2}D/{}^{2}P$ and ${{}^{2}P}_{+}/{{}^{2}P}_{-}$ from fast ($1{s}^{2},1s2s\,{}^{3}S$) mixed-state He-like ion beams in collisions with H2targets