Pass in an instance ref to daemon run loop rather than using DagsterInstance.get()

Summary: This lets us pass through scoped instance refs into daemon threads in the event that we allow you to create scoped instances.

Test Plan: Integration

Reviewers: alangenfeld, jordansanders, johann, rexledesma

Reviewed By: jordansanders

Differential Revision: https://dagster.phacility.com/D8919