Fixes the call to `WP_Query` within `get_page_by_title()` by using the correct title parameter, `title`.
Modify the `orderby` parameter to prioritize the oldest published date over the smallest post ID. This ensures the behaviour matches that of the previous version of `get_page_by_title()`.
The tests have been modified to include a populated post table to ensure the posts returned are matched by design rather than coincidence.
Follow up to [54234].
Props dd32, timothyblynjacobs, peterwilsoncc.
Fixes#56609.
See #36905.
git-svn-id: https://develop.svn.wordpress.org/trunk@54271 602fd350-edb4-49c9-b593-d223f7449a82