Terminal is flooded with warnings when running tests

[benedikt-richter]

When running tests, e.g. using yarn test:unit the terminal is flooded with warnings like:

  Warning: An update to $Component 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 */

Some of these warnings can be fixed by wrapping the testStore.dispatch(...) into an act(...) in the tests. However, not all of these warnings are fixable by this approach.

The goal of the current ticket is to get rid of the warnings.

Note: this might be related to our upgrade to React 18.

[benedikt-richter]

Superceded by #1273