joedolson 1141b9fee2 Administration: Use admin notice functions in nav menu admin.
Use `wp_get_admin_notice` and `wp_admin_notice` to handle settings notices on the nav menu admin screens.

Props joedolson.
See #57791.
Built from https://develop.svn.wordpress.org/trunk@56518


git-svn-id: http://core.svn.wordpress.org/trunk@56030 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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