ui: Make `Callout` constructors more flexible (#29895)

This PR updates the `Callout` constructors to be more flexible by
accepting `impl Into<SharedString>`s.

Release Notes:

- N/A
3e2abbf53bMarshall Bowers committed on 5/5/2025, 1:18:48 AM· committed by GitHubparenta2fa10f
3 files changedLine totals unavailable