cubicweb-brainomics #4627755 zip export: handle cases where there are multiple labels [validation pending]

prioritynormal
typebug
done in0.11.5
load0.250
load left0.000
closed by#e9e0e8ed9656 [views] Factor out entity label in Zip download view (closes #4627755)
patch[views] Factor out entity label in Zip download view [applied]