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

[fabpot]

Thank you @yoeunes.