gqltest: suggestion tests include suggestions
Created by: keegancsmith
When these break it is impossible to know why. We now include a diff between what we want and expect.
Example failing build: https://buildkite.com/sourcegraph/sourcegraph/builds/112634#146e35e5-8e6b-4ab3-9c94-4502f8072f54
Backend integration tests: https://buildkite.com/sourcegraph/sourcegraph/builds/112668