PSR12/ClassInstantiation: fix sniff to work with the PHP 8 identifier tokens

Includes some additional tests to cover the change.

Author: jrfnl

src/Standards/PSR12/Sniffs/Classes/ClassInstantiationSniff.php

@@ -43,9 +43,8 @@ public function process(File $phpcsFile, $stackPtr)
         $tokens = $phpcsFile->getTokens();
 
         // Find the class name.
-        $allowed = [
-            T_STRING                   => T_STRING,
-            T_NS_SEPARATOR             => T_NS_SEPARATOR,
+        $allowed  = Tokens::$nameTokens;
+        $allowed += [
             T_SELF                     => T_SELF,
             T_STATIC                   => T_STATIC,
             T_PARENT                   => T_PARENT,

src/Standards/PSR12/Tests/Classes/ClassInstantiationUnitTest.inc

@@ -49,3 +49,8 @@ $foo = new parent;
 // PHP 8.3: safeguard that the sniff ignores anonymous classes, even when declared as readonly.
 $anon = new readonly class {};
 $anon = new #[MyAttribute] readonly class {};
+
+$foo = new \FQN\Bar();
+$foo = new namespace\Bar();
+$foo = new \FQN\Bar;
+$foo = new namespace\Bar;

src/Standards/PSR12/Tests/Classes/ClassInstantiationUnitTest.inc.fixed

@@ -49,3 +49,8 @@ $foo = new parent();
 // PHP 8.3: safeguard that the sniff ignores anonymous classes, even when declared as readonly.
 $anon = new readonly class {};
 $anon = new #[MyAttribute] readonly class {};
+
+$foo = new \FQN\Bar();
+$foo = new namespace\Bar();
+$foo = new \FQN\Bar();
+$foo = new namespace\Bar();

src/Standards/PSR12/Tests/Classes/ClassInstantiationUnitTest.php

@@ -49,6 +49,8 @@ public function getErrorList()
             37 => 1,
             38 => 1,
             47 => 1,
+            55 => 1,
+            56 => 1,
         ];
 
     }//end getErrorList()