Dropdown - Update Dropdown component to use new Floating UI wrapper.

[nicolethoen]

Create a beta prop to optionally allow products to use new floating UI implementation rather than popper. Update all examples in Dropdown docs to use this new prop.

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Jira Issue: PF-2676

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.