feat(dropdowns): migrate to Floating UI

What does this MR do?

This migrates Popper.js to its successor, Floating UI.

Additionally, this applies the size middleware to prevent dropdowns from overflowing the viewport vertically. This is done by applying a max-height to the dropdown's content, so that only the scrollable area's height is changed, while other static areas (e.g. a listbox's header or footer) keep their original height.

Screenshots or screen recordings

Before	After
before	after

Integration merge requests

• GitLab: gitlab!118987 (closed)
• [-] CustomersDot: mr_url
• [-] Status Page: mr_url

Closes #2213 (closed)