Add an event if a user is archived

This adds a new type of event, 'archive_user', which stores the id of
the archived user and the id of the user who is doing the archiving.

tests/app/test_event_handlers.py

@@ -2,6 +2,7 @@ import uuid
 from unittest.mock import ANY
 
 from app.event_handlers import (
+    create_archive_user_event,
     create_email_change_event,
     create_mobile_number_change_event,
     on_user_logged_in,
@@ -51,3 +52,18 @@ def test_create_mobile_number_change_event_calls_events_api(app_, mock_events):
                                         'updated_by_id': updated_by_id,
                                         'original_mobile_number': '07700900000',
                                         'new_mobile_number': '07700900999'})
+
+
+def test_create_archive_user_event_calls_events_api(app_, mock_events):
+    user_id = str(uuid.uuid4())
+    archived_by_id = str(uuid.uuid4())
+
+    with app_.test_request_context():
+        create_archive_user_event(user_id, archived_by_id)
+
+        mock_events.assert_called_with('archive_user',
+                                       {'browser_fingerprint':
+                                        {'browser': ANY, 'version': ANY, 'platform': ANY, 'user_agent_string': ''},
+                                        'ip_address': ANY,
+                                        'user_id': user_id,
+                                        'archived_by_id': archived_by_id})