Move the `LoadingLabel` component to the UI crate (#33893)

So we can use it in other places and don't require them to depend on the
`agent_ui`. This PR also renames it from `AnimatedLabel` to
`LoadingLabel`.

Release Notes:

- N/A
5253702200Danilo Leal committed on 7/4/2025, 4:49:11 AM· committed by GitHubparented7552d
6 files changedLine totals unavailable