MDL-75777 phpunit: Move tests to use correct names and ns (take#6)

Applied the following changes to various testcase classes:

- Namespaced with component[\level2-API]
- Moved to level2-API subdirectory when required.
- Fixed incorrect use statements with leading backslash.
- Remove file phpdoc block
- Remove MOODLE_INTERNAL if not needed.
- Changed code to point to global scope when needed.
- Fix some relative paths and comments here and there.
- All them passing individually.
- Complete runs passing too.

question/engine/tests/questionattemptstep_test.php

@@ -14,15 +14,10 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-/**
- * This file contains tests for the question_attempt_step class.
- *
- * @package    moodlecore
- * @subpackage questionengine
- * @copyright  2009 The Open University
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
+namespace core_question;
 
+use question_attempt_step;
+use question_state;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -30,14 +25,15 @@ global $CFG;
 require_once(__DIR__ . '/../lib.php');
 require_once(__DIR__ . '/helpers.php');
 
-
 /**
  * Unit tests for the {@link question_attempt_step} class.
  *
+ * @package    core_question
+ * @category   test
  * @copyright  2009 The Open University
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class question_attempt_step_test extends advanced_testcase {
+class questionattemptstep_test extends \advanced_testcase {
     public function test_initial_state_unprocessed() {
         $step = new question_attempt_step();
         $this->assertEquals(question_state::$unprocessed, $step->get_state());
@@ -129,7 +125,6 @@ class question_attempt_step_test extends advanced_testcase {
 
     }
 
-
     /**
      * Test get_user function.
      */