Reconfigure Jest for new backend integration tests and clear outdated configs

[dannyprikaz]

Overview

We are updating our integration tests such that they should not reset the state of the test databases between tests. We need to reconfigure jest and our set-up modules to support this. Additionally, there are some old and unused configurations that should be removed.

Action Items

• Remove configs related to the @shelf/jest-mongodb preset
• Write a new method in setup-test.js that sets up a MongoMemoryServer but doesn't removeAllCollection afterEach

Resources/Instructions

• This issue is part of the epic: Epic: Write new backend integration tests for router-controller-model flow #1899