[web/request] clearly mark user_callback-related methods as deprecated
The deprecated decorator not only emits a warning at run-time
but above all makes the deprecation immediately apparent in the source.
closes #3567793.
sync_schema_props_perms(('State', 'state_of', 'Workflow'), commit=False)
sync_schema_props_perms(('State', 'name', 'String'))