[Backport 8.17] Fix xpack.usage ILM actions

[github-actions]

Backport cf8e0b8 from #3265.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ilm.delete_lifecycle	🟢	2/2	2/2
ilm.explain_lifecycle	🟢	5/5	5/5
ilm.get_lifecycle	🟢	8/8	8/8
ilm.get_status	🟢	4/4	4/4
ilm.migrate_to_data_tiers	⚪	Missing test	Missing test
ilm.move_to_step	⚪	Missing test	Missing test
ilm.put_lifecycle	🟢	6/6	6/6
ilm.remove_policy	🟢	5/5	5/5
ilm.retry	⚪	Missing test	Missing test
ilm.start	⚪	Missing test	Missing test
ilm.stop	🟢	4/4	4/4
xpack.usage	🔴	40/40	2/36

You can validate these APIs yourself by using the make validate target.