Tests: Add image editor specific group annotations for resize test classes.

This adds the `wp-image-editor-gd` and `wp-image-editor-imagick` group annotation to the `Test_Image_Resize_GD` and `Test_Image_Resize_Imagick` test classes, respectively.

See #63167.

git-svn-id: https://develop.svn.wordpress.org/trunk@60769 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

tests/phpunit/tests/image/resizeGd.php

@@ -5,6 +5,7 @@
  * @group media
  * @group upload
  * @group resize
+ * @group wp-image-editor-gd
  *
  * @requires function imagejpeg
  */

tests/phpunit/tests/image/resizeImagick.php

@@ -5,6 +5,7 @@
  * @group media
  * @group upload
  * @group resize
+ * @group wp-image-editor-imagick
  */
 require_once __DIR__ . '/resize.php';