MDL-73971 phpunit: Move more tests to use correct names and namespaces

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.

Special mention to:

- Some fixtures, initially defined in the test files have been
  moved to new files in fixtures subdirectory, leaving the unit
  test files clearer:
  - moodle2_course_format_test.php
- Rename wrong named test:
  - baseoptiogroup_test = baseoptigroup_test

competency/tests/course_module_competency_test.php

@@ -14,18 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
-/**
- * Course module competency persistent class tests.
- *
- * @package    core_competency
- * @copyright  2019 Damyon Wiese
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-defined('MOODLE_INTERNAL') || die();
-global $CFG;
-
-use core_competency\course_module_competency;
+namespace core_competency;
 
 /**
  * Course module competency persistent testcase.
@@ -34,7 +23,7 @@ use core_competency\course_module_competency;
  * @copyright  2019 Damyon Wiese
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class core_competency_course_module_competency_testcase extends advanced_testcase {
+class course_module_competency_test extends \advanced_testcase {
 
     public function test_count_competencies() {
         global $CFG, $DB;