[DeadCode] Check TemplateType instance check on Dead*TagValueNodeAnalyzer

[samsonasik]

per #6399 (comment)

Check TemplateType instance on specific Dead*TagValueNodeAnalyzer, ensuring existing equal type check still works.

Only on dead code rules that mark it as used, as defined in Class_ @template

[samsonasik]

By this, the mixed native param type with @template usage cause downgrade rule apply:

➜  rector-src git:(check-template) bin/rector process src/PhpAttribute/Contract/AnnotationToAttributeMapperInterface.php --config build/config/config-downgrade.php --dry-run --clear
-cache
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1 file with changes
===================

1) src/PhpAttribute/Contract/AnnotationToAttributeMapperInterface.php:10

    ---------- begin diff ----------
@@ @@
  */
     /**
-     * @param T $value
+     * @param mixed $value
      */
-    public function map(mixed $value): Expr;
+    public function map($value): Expr;
 }
    ----------- end diff -----------

Applied rules:
 * DowngradeMixedTypeDeclarationRector

if type param is equal, it should be keep as T as is. I will look more.

[samsonasik]

should be ok now

[samsonasik]

All checks have passed 🎉 @TomasVotruba I am merging it ;)