DropDown with simplified Collection doesn't render markup properly

[matuzalemsteles]

We recently introduced the Collection pattern in DropDown #5101, there is a simplified composition for rendering the items in DropDown, which only needs to declare the Items as a child of the DropDown but that doesn't render the ItemList by default, causing it to break the markup and have accessibility issues as a result.

<ClayDropDown
  items={['one', 'two', 'three', 'four']}
  trigger={<ClayButton>Click Me</ClayButton>}
>
  {(item) => <ClayDropDown.Item key={item}>{item}</ClayDropDown.Item>}
</ClayDropDown>

[github-actions]

This issue has been merged and will be released in DXP at https://issues.liferay.com/browse/LPS-166807