client: Add `CloudUserStore` (#35370)

This PR adds a new `CloudUserStore` for storing information about the
user retrieved from Cloud instead of Collab.

Release Notes:

- N/A
bb1a7ccbbaMarshall Bowers committed on 7/30/2025, 10:43:10 PM· committed by GitHubparent289f420
7 files changedLine totals unavailable