[server/test] kill remaining 3.19 deprecation warnings in undo tests

[devtools] accept str objects in CubicWebTC.new_access and .create_user

[utils] use the "predictable" argument to js_dumps Fixes doctest under python -R. Related to #4959402.

[server/test] don't rely on a sorted output from .object_relations() Fixes test under python -R. Related to #4959402.

[req] make rebuild_url predictable Fixes test with python -R. Related to #4959402.

[web/test] don't depend on iteration order on a set Fixes test under python -R ('pending_insert' in session data is a set, so we can't rely on any particular ordering). Related to #4959402.

[web/test] fix cubicweb 3.19 deprecation warning

[web/test] use unicode instead of str for user logins makes lgdb/sqlite quieter.

[test] Don't depend on dict iteration ordering Fixes test with python -R. Related to #4959402.

[entities] make cw_fti_index_rql_queries predictable Don't depend on the hash function, fixing test with python -R. Related to #4959402.

[hooks/syncschema] use a list instead of a set for UpdateFTIndexOp The order in which etypes get indexed matters. Related to #4959402.

[rqlrewrite] sort possible types when turning is_instance_of into is Helps get predictable output even with python -R. Related to #4959402.

[server/test] use unicode strings for user logins

[web/test] use unicode object as user login (py.warnings) WARNING: /home/jcr/src/cw/cubicweb/devtools/testlib.py:206: DeprecationWarning: Sanitizing an input dictionary with str values, please check your data (key = 'login')