Fix cycle() with non-countable ArrayAccess+Traversable objects

[yoeunes]

When using cycle() with an object that implements \ArrayAccess and \Traversable but is not \Countable, the function currently returns the object instance immediately after triggering the deprecation notice.

This prevents the value from being converted to an array, causing the cycle logic to fail or return the object itself.

This PR removes the early return to ensure self::toArray() is called, allowing these objects to be cycled correctly as expected.

How to test

$seq = new class implements \ArrayAccess, \IteratorAggregate {
    public function offsetExists($offset): bool { return true; }
    public function offsetGet($offset): mixed { return 'val'; }
    public function offsetSet($offset, $value): void {}
    public function offsetUnset($offset): void {}
    public function getIterator(): \Traversable { yield 'odd'; yield 'even'; }
};

// Should return 'odd', currently returns the $seq object
$result = CoreExtension::cycle($seq, 0);

Related to #4241

[stof]

shouldn't this line be inside the !is_countable block (in the place that had the broken return). AFAICT, the intent of the is_countable check was to allow using the ArrayAccess&Countable object without converting it.

[yoeunes]

Hi @stof, thanks for the feedback! The conversion to array is now only performed inside the !is_countable block as suggested.