[9.x] Pass collection instance into tap directly, not a clone (#36220)

* Pass instance into `tap` directly

* Use `tap` instead of `pipe` in test

Author: JosephSilber

Traits/EnumeratesValues.php

@@ -764,7 +764,7 @@ public function reject($callback = true)
      */
     public function tap(callable $callback)
     {
-        $callback(clone $this);
+        $callback($this);
 
         return $this;
     }