Generic/UpperCaseConstantName: move parse error test to its own file

src/Standards/Generic/Tests/NamingConventions/UpperCaseConstantNameUnitTest.1.inc

@@ -34,7 +34,7 @@ $foo->getBar()?->define('foo');
 
 // PHP 8.3 introduces typed constants.
 class TypedConstants {
-    const MISSING_VALUE; // Parse error.
+
     const MyClass MYCONST = new MyClass;
     const int VALID_NAME = 0;
     final public const INT invalid_name = 0;

src/Standards/Generic/Tests/NamingConventions/UpperCaseConstantNameUnitTest.5.inc

@@ -0,0 +1,9 @@
+<?php
+
+// Intentional parse error (missing class constant value).
+// This should be the only test in this file.
+// Testing that the sniff is *not* triggered.
+
+class TypedConstants {
+    const MISSING_VALUE;
+}