Auto-launch graphql-engine (close hasura/graphql-engine#7801, hasura/graphql-engine#7827 )
Dupe of https://github.com/hasura/graphql-engine-mono/pull/2853 with branch renamed so it doesn't break a tool.
prev pr: https://github.com/hasura/graphql-engine-mono/pull/2911
next pr: https://github.com/hasura/graphql-engine-mono/pull/2922
This implements https://github.com/hasura/graphql-engine/issues/7801
Some points to keep in mind for review:
* How state is passed to the tests. Do we like how this works?
* I quite like it, with the opaque type [`State`](68f33051ca/server/tests-hspec/Harness/State.hs (L17)), we can avoid churn when adding things.
* The [setup/teardown](68f33051ca/server/tests-hspec/Spec.hs (L19-L31)) seems clean.
* By using hspec's own means to pass and denote context, we avoid "getting new ideas" for how to structure the tests -- we use a standard. Hopefully, that means the tests' structure rarely change.
* The various flags passed in the [ServeOptions](68f33051ca/server/tests-hspec/Harness/Constants.hs (L123)) - if there are any causes for concern, raise them here. My thinking is that, there are lots. I've picked some "sane" defaults (mostly empty). The tests pass. I think as we add more complex tests, these flags will be scrutinised and updated as needed. I think it's valuable that all flags are explicitly listed here, though.
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/2921
GitOrigin-RevId: 2c2e70bf784ef571a48509a7e5006fd0f48773b5
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