hivectl: drop forge create-user; SSO makes a human's forge account

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

hive-c0re/src/forge/mod.rs

@@ -21,7 +21,7 @@ pub use repos::{
     ensure_meta_remote, ensure_repo, ensure_shared_docs_repo, fast_forward_applied_main,
     fetch_config_main_into_applied, meta_read_access, push_config, push_meta, shared_docs_access,
 };
-pub use users::{core_token, provision_user_token};
+pub use users::core_token;
 
 use std::sync::OnceLock;
 use std::time::{Duration, Instant};