Pass object ids to filters in wp_delete_term()

[obenland]

If a site has a large amount of posts associated with a term, custom queries hooked into delete_term or delete_$taxonomy can become very expensive. On WordPress.com we pass the affected object ids to the actions as well, allowing for a more targeted query.

[obenland]

Also, $objects is the wrong variable name for this list. It should be $object_ids.

[obenland]

Updated WpDeleteTerm tests with stricter assertion

[obenland]

In 36080:

Taxonomy: Pass object ids to delete_* actions.

Allows for more targeted updates to affected posts in callbacks.
Disambiguates $objects variable and amends unit tests.

Fixes #35213.

[DrewAPicture]

In 36962:

Docs: Improve changelog entries added for the delete_term and delete_{$taxonomy} actions in [36080] and a third entry added for the clean_term_cache action in [36399]

See #35213, #35611. See #35986.