cubicweb-forge #3168584 suppress useless ExtProject require_permission relation [validation pending]

no permission are propagated there.

prioritynormal
typebug
done in1.10.1
load0.100
load left0.000
closed by#4792cfdda622 [schema] suppress useless ExtProject require_permission relation (closes #3168584)
patchcloses #3168584: suppress useless ExtProject require_permission relation [applied]