General: wp_safe_redirect() and wp_redirect() shouldn't allow non-3xx status codes

Redirects should use redirect status codes and if you attempt to call wp_safe_redirect or wp_redirect with a non redirect status it can lead to undesired behavior and head scratching.

Fixes #44317.
Props spenserhale, johnbillion, mjnewman for initial patch.


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git-svn-id: https://core.svn.wordpress.org/trunk@46441 1a063a9b-81f0-0310-95a4-ce76da25c4cd