[dagit] Don't disappear Daemon statuses when loading

Summary:
Resolves #3517

Since we're using network-only and hiding Daemon statuses when the query data isn't available yet, the table disappears and reappears a little too often.

@sashank, is there any cause for concern with changing this query to cache-and-network? I don't remember if there's anything related to your GRPC changes.

Instead, use cache-and-network to hang on to data that we have while refetching, and render a spinner when loading is in progress.

Test Plan: View /instance, use repository location reload and the countdown refresh. Verify rendering and behavior described above.

Reviewers: sashank

Reviewed By: sashank

Subscribers: sashank

Differential Revision: https://dagster.phacility.com/D5888