symmetric relations: replace bogus rql2sql translation by a hook The hook ensures X r Y => Y r X iff r is symmetric. The rql-no-hook data importer receives a small amendment but note that: * there exist no test for it * its actual semantics are undefined Hence we cannot prove this hunk breaks nothing, because we cannot prove anything. Closes #3259713.

     1

sync_schema_props_perms(('State', 'state_of', 'Workflow'), commit=False)

     2

sync_schema_props_perms(('State', 'name', 'String'))