wrap react tests in act

[theosanderson]

Our unit test logs have a lot of:

Warning: An update to Fe inside a test was not wrapped in act(...).

When testing, code that causes React state updates should be wrapped into act(...):

act(() => {
  /* fire events that update state */
});
/* assert on the output */

This ensures that you're testing the behavior the user would see in the browser. Learn more at https://reactjs.org/link/wrap-tests-with-act
    at Fe 

https://github.com/loculus-project/loculus/actions/runs/8668362408/job/23773286148

We should implement this. This may prevent some hacks I had to do to stop tests flaking which involved adding timeouts between steps.

[theosanderson]

The solution to this seems to be not handling the act wrapping ourselves but using await findByRole instead of getByRole (and similar renames throughout) which does the wrapping itself. https://medium.com/@AbbasPlusPlus/react-testing-library-understanding-act-and-when-to-use-it-301bd06fd1bc

[theosanderson]

(We probably want to tackle this soon as the spam makes dev hard)