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