`Test`: implement MSW for endpoint mocking and testing

[Seerden]

Title should be clear enough.

Resources;

• https://github.com/mswjs/msw
• https://mswjs.io/
• https://www.wwt.com/article/using-mock-service-worker-to-improve-jest-unit-tests
• https://codesandbox.io/s/s5hre
• https://stackoverflow.com/questions/66365701/how-to-test-components-using-react-query-with-msw-and-react-testing-library