Tests: Update the terminology used for action or filter names in `MockAction` class.

This replaces the "tag" wording with "hook name" where appropriate, to match the core function signatures.

Includes:
* Introducing a `::get_hook_names()` method instead of `::get_tags()`, keeping the latter as an alias.
* Adding a `hook_name` key to the `::$events` property, keeping `tag` for backward compatibility for now.
* Adding missing `@since` tags for class methods.

Follow-up to [24/tests], [62/tests], [70/tests], [50807], [53804].

See #55652.
Built from https://develop.svn.wordpress.org/trunk@53805


git-svn-id: http://core.svn.wordpress.org/trunk@53364 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-alpha-53804';
+$wp_version = '6.1-alpha-53805';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.