Remove old dependency from when the standard was in a plugin

Since we moved the standard from local_codechecker moodle plugin
to be standalone repository, CFG won't be defined ever, so we
don't need all the code making copies of some CFG settings and
restoring them afterwards.

Now we just set the minimum needed to run core_component methods
and done. No need to reset anything.

Author: stronk7

moodle/Util/MoodleUtil.php

@@ -61,7 +61,7 @@ abstract class MoodleUtil {
      */
     public static function setMockedComponentMappings(array $mappings): void {
         if (!defined('PHPUNIT_TEST') || !PHPUNIT_TEST) {
-            throw new \Exception('Not running in a unit test');
+            throw new \Exception('Not running in a unit test'); // @codeCoverageIgnore
         }
 
         self::$mockedComponentMappings = $mappings;
@@ -85,32 +85,15 @@ protected static function loadCoreComponent(string $moodleRoot): bool {
         defined('IGNORE_COMPONENT_CACHE') ?: define('IGNORE_COMPONENT_CACHE', 1);
         defined('MOODLE_INTERNAL') ?: define('MOODLE_INTERNAL', 1);
 
-        if (!isset($CFG->dirroot)) { // No defined, let's start from scratch.
-            $CFG = (object) [
-                'dirroot' => $moodleRoot,
-                'libdir' => "{$moodleRoot}/lib",
-                'admin' => 'admin',
-            ];
-        }
-
-        // Save current CFG values.
-        $olddirroot = $CFG->dirroot ?? null;
-        $oldlibdir = $CFG->libdir ?? null;
-        $oldadmin = $CFG->admin ?? null;
-
-        if ($CFG->dirroot !== $moodleRoot) { // Different, set the minimum required.
-            $CFG->dirroot = $moodleRoot;
-            $CFG->libdir = $CFG->dirroot . '/lib';
-            $CFG->admin = 'admin';
-        }
+        // Let's define CFG from scratch (it's not defined ever, because moodle-cs is not a Moodle plugin at all
+        $CFG = (object) [
+            'dirroot' => $moodleRoot,
+            'libdir' => "{$moodleRoot}/lib",
+            'admin' => 'admin',
+        ];
 
         require_once($CFG->dirroot . '/lib/classes/component.php'); // Load the class.
 
-        // Restore original CFG values.
-        $CFG->dirroot = $olddirroot ?? null;
-        $CFG->libdir = $oldlibdir ?? null;
-        $CFG->admin = $oldadmin ?? null;
-
         return true;
     }
 
@@ -225,7 +208,7 @@ protected static function calculateAllComponents(string $moodleRoot) {
      */
     public static function getMoodleComponent(File $file, $selfPath = true) {
         if (defined('PHPUNIT_TEST') && PHPUNIT_TEST && !empty(self::$mockedComponentMappings)) {
-            $components = self::$mockedComponentMappings;
+            $components = self::$mockedComponentMappings; // @codeCoverageIgnore
         } else {
             // Verify that we are able to find a valid moodle root.
             if (!$moodleRoot = self::getMoodleRoot($file, $selfPath)) {