Changeset 54234 for trunk/tests/phpunit/tests/post/getPageByTitle.php

Posts, Post types: Cache get_page_by_title().

Convert get_page_by_title() to a WP_Query wrapper to take advantage of the object caching built in to the latter.

Add dedicated unit tests for the function get_page_by_title().

Props spacedmonkey, boonebgorges, igmoweb, pcfreak30, pbearne.
Fixes #36905.