* Drop unused macros / includes
* Drop testcase relevant to legacy routing only
* Adapt SUT setup to work w/o legacy routing
While also ensuring that domain config does not spill into `ct_domain`
helper module.
* Sync Dockerfile w/ valitydev/erlang-templates
* Bump to valitydev/party-client-erlang@31850a6
* Switch to valitydev/party-management@f757b79 in testenv
* Add couple identity suite testcases