Primarily this is in tests (which were caught by temporarily
introducing acts_as_tenant and enabling safety checks), but notably
action cable connections were not working properly, and that's now
fixed.
* Bind sessions to identities
* Remove references to the identity token
* Move email changes to identity
* Move account menu into a turbo-frame
* Create tenants from a tenanted route
This really only impacts the Disk service in development.
I proposed this upstream in https://github.com/rails/rails/pull/55248,
but it's not clear if the presence of script_name should _always_
prefix generated URLs, so for now it's local to Fizzy.