MDL-86049 core: Do not use the component cache before purge

When trying to resolve a corrupt cache where it is not possible to
complete the Moodle setup/bootstrap, it is necessary to ignore the
current cache to load the cache purging infrastructure.

admin/cli/purge_caches.php

@@ -24,6 +24,7 @@
  */
 
 define('CLI_SCRIPT', true);
+define('IGNORE_COMPONENT_CACHE', true);
 
 require(__DIR__.'/../../config.php');
 require_once($CFG->libdir.'/clilib.php');

public/admin/purgecaches.php

@@ -23,6 +23,8 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+define('IGNORE_COMPONENT_CACHE', true);
+
 require_once('../config.php');
 require_once($CFG->libdir.'/adminlib.php');