NamingConventions/ObjectNameDepth: support PHP 8.2+ readonly classes

To check whether a class is deprecated, the sniff needs to skip over the potential class modifier keywords, like `final` and `abstract`.

As of PHP 8.2, it will also need to skip over the new `readonly` keyword.

Includes unit tests.

Yoast/Sniffs/NamingConventions/ObjectNameDepthSniff.php

@@ -5,6 +5,7 @@
 use PHP_CodeSniffer\Files\File;
 use PHP_CodeSniffer\Sniffs\Sniff;
 use PHP_CodeSniffer\Util\Tokens;
+use PHPCSUtils\Tokens\Collections;
 use PHPCSUtils\Utils\Namespaces;
 use PHPCSUtils\Utils\ObjectDeclarations;
 use WordPressCS\WordPress\Helpers\SnakeCaseHelper;
@@ -129,11 +130,8 @@ public function process( File $phpcsFile, $stackPtr ) {
 		}
 
 		// Check if the OO structure is deprecated.
-		$ignore = [
-			\T_ABSTRACT   => \T_ABSTRACT,
-			\T_FINAL      => \T_FINAL,
-			\T_WHITESPACE => \T_WHITESPACE,
-		];
+		$ignore                  = Collections::classModifierKeywords();
+		$ignore[ \T_WHITESPACE ] = \T_WHITESPACE;
 
 		$comment_end = $stackPtr;
 		for ( $comment_end = ( $stackPtr - 1 ); $comment_end >= 0; $comment_end-- ) {

Yoast/Tests/NamingConventions/ObjectNameDepthUnitTest.2.inc

@@ -135,3 +135,18 @@ enum MyEnumName {} // OK.
 enum Too_Long_Enum_Name: int {} // Error.
 enum TooLongEnumName: int {} // Error.
 enum Three_Word_Name_Mock: string implements Word_Interface {} // OK.
+
+/**
+ * Class description, no @deprecated tag.
+ *
+ * @since x.x.x
+ */
+#[Some_Attribute]
+readonly class Active_Class_With_Attribute_With_Too_Long_Class_Name {} // Error.
+
+/**
+ * Class description.
+ *
+ * @deprecated x.x.x
+ */
+final readonly class Deprecated_Readonly_Class_With_Too_Long_Class_Name {} // OK.

Yoast/Tests/NamingConventions/ObjectNameDepthUnitTest.php

@@ -44,6 +44,7 @@ public function getErrorList( string $testFile = '' ): array {
 					116 => 1,
 					135 => 1,
 					136 => 1,
+					145 => 1,
 				];
 
 			default: