Entity save() in hook_ENTITY_TYPE_insert()

Problem/Motivation

The existing implementation of hook_ENTITY_TYPE_insert has two places where the entity is updated and saved. This is recursive and causes another round of calls to the presave and update hooks.

It is bad practice to save an entity while processing an insert or update hook. Changes to an entity should be done in a presave hook.

Proposed resolution

Add a new hook_ENTITY_TYPE_presave() and make the required updates there instead of in the insert hook.