cubicweb #3608172 rename_relation_type is dangerous [validation pending]

Using rename_relation_type in a migration script when what one really wants is rename_relation_definition leads to data loss since it silently deletes the other relation definitions for that rtype.

prioritynormal
typebug
done in3.18.5
load0.500
load left0.000
closed by#737983d87497 [migractions] add sanity check in rename_relation_type
patch[migractions] add sanity check in rename_relation_type [applied]