This moved the `beforeEach` blocks inside the `describe` blocks as per documentation.
Previously the code inside `beforeEach` didn't trigger which lead to problems with asynchrocinity as mocks didn't get cleared.
This updates the files to be compatible with Vitest. Changes include:
- adding `@testing-library/jest-dom` import to enable custom jest matchers
- renaming `jest.` to `vi.`
- setting flags to false as default where needed
