Handles outdated versions of the `core/latest-posts` block by converting attribute `categories` from a numeric string to an array with key `id`.
block_core_latest_posts_get_excerpt_length
Callback for the excerpt_length filter used by the Latest Posts block at render time.
register_block_core_latest_posts
Registers the `core/latest-posts` block on server.
render_block_core_latest_posts
Renders the `core/latest-posts` block on server.
