Admin Menu: Deprecate `add_object_page()` and `add_utility_page()`.

These functions are not used in core and are just wrappers for `add_menu_page()`.

Fixes #23108.
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git-svn-id: https://core.svn.wordpress.org/trunk@35838 1a063a9b-81f0-0310-95a4-ce76da25c4cd