[Reporting] ILM policy for managing reporting indices (#100130)

* wip; added logic for creating ILM policy at start up

* added log when ilm policy is not created

* added test for start function

* updated ilm policy to not delete data

* actually update jest snapshots and remove unused import

* updated the ilm policy, removed the min_age for the hot phase

* update jest snapshot

* removed TODO comment

* debug log -> info log

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>