cubicweb #5557633 [sqlserver] crash on size constraint modification [validation pending]

Modifying a size constraint will crash cubicweb at sync_schema_props_perms(etype) time.

priorityimportant
typebug
done in3.19.13
load3.000
load left0.000
closed by#80236876ee4d [hooks/syncschema] only call "ALTER TABLE" once when changing a size constraint
patch[hooks/test/synschema] remove an unneeded skipTest. [applied][hooks/syncschema] only call "ALTER TABLE" once when changing a size constraint [folded][hooks/syncschema] remove the rdef old constraint after the database column has been altered, to prevent an sqlserver crash [applied]