This essentially restores the original code from c425b554b8
(https://github.com/hasura/graphql-engine/pull/4013). Prior to this
commit we would slurp messages as fast as possible from the database
(one thing c425b55 fixed).
Another thing broken as a consequence of the same logic was the
removeEventFromLockedEvents logic which unlocks in-flight events
(breaking at-least-once delivery)
Some archeology, post-c425b55:
- cc8e2ccc erroneously attempted to refactor using `bracket`, resulting
in the same slurp-all-events behavior (since we don't ever wait for
processEvent to complete)
- at some point event processing within a batch is made serial, this
reported as a bug. See: https://github.com/hasura/graphql-engine/issues/5189
- in 0ef52292b5 (which I approved...) an `async` is added, again
causing the same issue...
GitOrigin-RevId: d8cbaab385267a4c3f1f173e268a385265980fb1
