(dagster-cli-api-run-launcher-5.5) Revamp dagster-graphql scheduler test…


(dagster-cli-api-run-launcher-5.5) Revamp dagster-graphql scheduler test infrastructure

In preparation for having all graphql tests launch run out-of-process,
we need to clean up some more graphql test infra, because we need better control
over the graphql context. These tests require the filesystem scheduler so we
just configure that on the test graphql context by default

Depends on D3038

Test Plan: BK

Reviewers: alangenfeld, max, sashank

Reviewed By: sashank

Differential Revision: https://dagster.phacility.com/D3048