[Bug] Circular dependencies

[Agupane]

There is a circular dependency on the code, it's shown on a race condition, so it's not easy to reproduce it. It appears mostly on the check round change job.

The error is the following one:

Update 26/07:

We found a way to reproduce the error:

1- Use the branch test/circularDependencybug
2- See the code on /server/helpers/delegatorUtils.js line function getDelegatorSummary30RoundsRewards. Note that this function is different from the one on development (has promise all). The idea of using Promise.all() is to force the race condition to appear
3- Make an api call to the following api with a delegatorAddress with values on the db: http://localhost:4040/api/delegators/lastRewards/DELEGATORADDRESS
4- Repeat the api call until the error appears (it's a race condition, so could happen that it's not always appearing)