Coding Standards: Update the config for `WordPress.PHP.FileName` in PHPCS ruleset.

The WPCS sniff already takes the test classes in the `tests/phpunit/includes` directory into account.

Only the test cases outside of that directory, i.e. in the `tests/phpunit/tests` directory need to be listed here.

Includes alphabetizing the list.

Follow-up to [42346], [45607].

Props jrf, hellofromTonya, SergeyBiryukov.
See #53359.
Built from https://develop.svn.wordpress.org/trunk@51659


git-svn-id: http://core.svn.wordpress.org/trunk@51265 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51658';
+$wp_version = '5.9-alpha-51659';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.