Sergey Biryukov f891f6f0c6 Administration: Require a valid action parameter to be set for admin-ajax.php requests.
This avoids `Array to string conversion` PHP notices when an array is passed as the `action` parameter.

Additionally, send an appropriate HTTP response status code when an invalid action is passed to `admin-post.php`.

Follow-up to [13175], [19738], [41120], [41926].

Props dd32.
Fixes #55212.
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git-svn-id: http://core.svn.wordpress.org/trunk@52402 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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