[web/session] make sure not to modify an inner value of session.data (closes #11217958) When we modify a mutable value stored in the session's data (dict-like object) we prevent an alternative session data handler (eg. pyramid-redis-session) from detecting this update and synchronizing it in its backend (like redis).

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drop_relation_definition('CWSourceSchemaConfig', 'cw_schema', 'CWAttribute')

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sync_schema_props_perms('cw_schema')