This addresses two instances of the (numeric string) return value from `wp_count_terms()` being used directly in `ceil()`, which expects an `int|float`.
Affected methods:
* `WP_Sitemaps_Taxonomies::get_max_num_pages()`
* `wp_nav_menu_item_taxonomy_meta_box()`
Reference: [https://www.php.net/manual/en/function.ceil.php PHP Manual: ceil()].
Follow-up to [14248], [14291], [14569], [14943], [48072], [57648].
Props justlevine.
See #52217.
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