Suppress ExcessiveClassComplexity for RememberedIdpCookie

# If applied, this commit will...
Add a class-level PHPMD suppression for ExcessiveClassComplexity on
RememberedIdpCookie.

# Why is this change needed?
Prior to this change, phpmd was clean on this class; the
loadValidEntriesFromRequest() helper added earlier in this branch
pushes the class's weighted method count to exactly the default
threshold of 50, failing the ci/qa-config/phpmd.xml check.

# How does it address the issue?
This change adds a targeted
@SuppressWarnings(PHPMD.ExcessiveClassComplexity) docblock on the
class, the same pattern already used for other PHPMD exceptions in
this codebase (e.g. DiContainerRuntime), rather than splitting the
class or reverting the encapsulation improvement.

# Provide links to any relevant tickets, articles or other resources
#2091

Author: kayjoosten

src/OpenConext/EngineBlock/Service/Wayf/RememberedIdpCookie.php

@@ -28,6 +28,9 @@
 use RuntimeException;
 use Symfony\Component\HttpFoundation\Request;
 
+/**
+ * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
+ */
 final class RememberedIdpCookie
 {
     public const NAME = 'rememberedidps';