MDL-74954 core: remove failing hooks test for now

lib/tests/hook/manager_test.php

@@ -224,20 +224,6 @@ public function testy_is_deprecated_plugin_callback() {
         $this->assertFalse($testmanager->is_deprecated_plugin_callback('legacycallback'));
     }
 
-    /**
-     * Test detection of legacy callbacks.
-     * @covers ::is_deprecating_hook_present
-     */
-    public function testy_is_deprecating_hook_present() {
-        $componentfiles = [
-            'test_plugin1' => __DIR__ . '/../fixtures/hook/hooks1_valid.php',
-        ];
-        $testmanager = manager::phpunit_get_instance($componentfiles);
-        // There is not much to test because there should not be any legacy callbacks left,
-        // plugin that have these should test their code.
-        $this->assertFalse($testmanager->is_deprecating_hook_present('test_pluing', 'xyz'));
-    }
-
     /**
      * Tests callbacks can be overridden via CFG settings.
      * @covers ::load_callbacks