cubicweb-embed #3001779 remove pre cw 3.9 bw compat [validation pending]

prioritynormal
typeenhancement
done in0.2.0
load0.100
load left0.000
closed by#e5a1d194cd11 [views] remove pre cw-3.9 bw compat (closes #3001779)
patch[views] remove pre cw-3.9 bw compat (closes #3001779) [applied]