Fix rule message: yaml_parser_class is no longer a Drupal setting

The actual benefit of Drupal\Component\Serialization\Yaml::decode() over
Symfony\Component\Yaml\Yaml::parse() is consistent exception handling
(InvalidDataTypeException) and correct parse flags.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mglaman

src/Rules/Drupal/SymfonyYamlParseRule.php

@@ -11,9 +11,9 @@
 /**
  * Detects direct usage of Symfony's YAML parser and suggests the Drupal wrapper.
  *
- * Drupal\Component\Serialization\Yaml::decode() respects the yaml_parser_class
- * setting, allowing sites to override the parser. Using Symfony's class directly
- * bypasses that setting.
+ * Drupal\Component\Serialization\Yaml::decode() should be used instead of
+ * Symfony\Component\Yaml\Yaml::parse() because it wraps exceptions as
+ * InvalidDataTypeException and applies consistent parse flags.
  *
  * @implements Rule<StaticCall>
  */
@@ -45,7 +45,7 @@ public function processNode(Node $node, Scope $scope): array
 
         return [
             RuleErrorBuilder::message(
-                'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which respects the yaml_parser_class setting.'
+                'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which handles exceptions consistently and applies the correct parse flags.'
             )
             ->identifier('drupal.symfonyYamlParse')
             ->build(),

tests/src/Rules/SymfonyYamlParseRuleTest.php

@@ -18,11 +18,11 @@ public function testRule(): void
             [__DIR__ . '/data/symfony-yaml-parse.php'],
             [
                 [
-                    'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which respects the yaml_parser_class setting.',
+                    'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which handles exceptions consistently and applies the correct parse flags.',
                     6,
                 ],
                 [
-                    'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which respects the yaml_parser_class setting.',
+                    'Avoid calling Symfony\Component\Yaml\Yaml::parse() directly. Use \Drupal\Component\Serialization\Yaml::decode() instead, which handles exceptions consistently and applies the correct parse flags.',
                     9,
                 ],
             ]