cubicweb-vcsfile #4873157 [migration] removing entire entity types takes forever [validation pending]

we shouldn't use drop_entity_type for something this massive

prioritynormal
typebug
done in2.0.3
load1.000
load left0.000
closed by#9b48447b5748 [migration] make removal of VersionContent entities bearable
patch[migration] make removal of VersionContent entities bearable [applied]