The forge now creates a human's account on their first authelia login,
so the verb has no job left. Deletes it, HostRequest::ForgeCreateUser,
its handler, provision_user_token, change_user_password and the hive's
TOKEN_SCOPES. change_user_password also passed the password as an
argument to `forgejo admin user change-password`, so it showed in the
container's process list.
ensure_user_exists and mint_token stay for the `core` bootstrap, their
one caller now. ensure_user_exists loses its password parameter: only the
deleted path set one.
Refs #3782
ef494af188