Adding api call and tests to propertyListings component

[Cm290]

• Replacing the dummy data with a call to the API
• Adding a loading and empty state to the component
• Adding the 'msw' library to mock the api calls in test
• Replacing 'jest-environment-jsdom' with 'jest-fixed-jsdom' as a workaround to allow the use of 'msw' (This should do the exact same thing, but reintroduces Node.js modules ooriginally replaced with polyfills in 'jest-environment-jsdom', explanation here: https://mswjs.io/docs/migrations/1.x-to-2.x/#frequent-issues)
• Corrected test to account for new implementation of api call
• Added tests for Loading state, Empty state and Error state