Revert the conversion of adjacent post queries to WP_Query. Explanation on the ticket.

Reverts [27285], [27286], [27287], [27288], [27291], [27292], [27293], [27296], [27633], [27634], [27635], and [27692].

see #26937.

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Avoid infinite recursion in get_term_children() when a term is incorrectly a parent of itself.

props kovshenin.
fixes #27123.

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Add a value to the password checkbox when creating a new user so the toggle is remembered.

props chriseverson, SergeyBiryukov.
fixes #27006.

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