CI: use 4 jest workers to prevent OOM
Created by: chrismwendt
This prevents the Buildkite agents from getting killed due to OOM when run on CI nodes with 96 cores, which by default causes 96 jest workers to be spawned.
Created by: chrismwendt
This prevents the Buildkite agents from getting killed due to OOM when run on CI nodes with 96 cores, which by default causes 96 jest workers to be spawned.