Issue #2923168 by AJV009, Yujiman85, benjifisher, runeasgar: Rename...

Issue #2923168 by AJV009, Yujiman85, benjifisher, runeasgar: Rename ConstraintsTest to UuidValidatorTest

(cherry picked from commit ee585649)

core/tests/Drupal/KernelTests/Core/Validation/ConstraintsTest.php → core/tests/Drupal/KernelTests/Core/Validation/UuidValidatorTest.php

@@ -7,11 +7,11 @@
 use Drupal\KernelTests\KernelTestBase;
 
 /**
- * Tests various low level constrains provided by core.
+ * Tests the UUID validator.
  *
  * @group Validation
  */
-class ConstraintsTest extends KernelTestBase {
+class UuidValidatorTest extends KernelTestBase {
 
   /**
    * {@inheritdoc}