feat(gitlab-ci): use `--runInBand` with `jest`
It is generally slower, but it is less memory and CPU intensive, so it reduces the risk of failure for the CI worker. See https://jestjs.io/docs/cli#--runinband
It is generally slower, but it is less memory and CPU intensive, so it reduces the risk of failure for the CI worker. See https://jestjs.io/docs/cli#--runinband