Remove command to replay callbacks

In response to [1].

I've already removed the runbook that referred to this.

[1]: https://github.com/alphagov/notifications-api/pull/3383#discussion_r765644576

tests/app/test_commands.py

@@ -1,6 +1,4 @@
-import uuid
-
-from app.commands import local_dev_broadcast_permissions, replay_callbacks
+from app.commands import local_dev_broadcast_permissions
 from app.dao.services_dao import dao_add_user_to_service
 from tests.app.db import create_user
 
@@ -23,27 +21,3 @@ def test_local_dev_broadcast_permissions(
 
     assert len(user.get_permissions(sample_service.id)) == 0
     assert len(user.get_permissions(sample_broadcast_service.id)) > 0
-
-
-def test_replay_callbacks(
-    mocker,
-    sample_service,
-    sample_notification,
-    tmpdir,
-    notify_api,
-):
-    mock_task = mocker.patch('app.commands.check_and_queue_callback_task')
-    file_path = tmpdir + 'callback_ids.txt'
-    missing_notification_id = uuid.uuid4()
-
-    with open(file_path, 'w') as f:
-        f.write(str(sample_notification.id) + "\n")
-        f.write(str(missing_notification_id) + "\n")
-
-    result = notify_api.test_cli_runner().invoke(
-        replay_callbacks, ['-f', file_path]
-    )
-
-    assert f'{missing_notification_id} was not found' in result.output
-    mock_task.assert_called_once_with(sample_notification)
-    assert result.exit_code == 0