Ignore BackedEnumFromTrait test errors on PHP < 8.1

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CKrYCc9qg3QPkVPpXFRS7T

Author: ondrejmirtes

build/enums.neon

@@ -17,3 +17,7 @@ parameters:
 			message: '#^Class CustomDeprecations\\MyDeprecatedEnum not found\.$#'
 			paths:
 				- ../tests/PHPStan/Reflection/Deprecation/DeprecationProviderTest.php
+		-
+			message: '#^Call to method PHPUnit\\Framework\\Assert\:\:assertSame\(\) with ''BackedEnum(FromTrait…)?'' and class\-string will always evaluate to false\.$#'
+			count: 3
+			path: ../tests/PHPStan/Reflection/ClassReflectionTest.php