Add GUI tests for metainfo browser and the archive browser

Closes #807 (closed). Adds "dumb" gui render tests, that recursively browse through a decent portion of the Metainfo browser tree and an example archive. The tests check that the lanes render, that the lane error boundary is not hit, and that nothing is printed to the console. All issues discovered by the testing are also resolved.

The tests take several minutes to run, and because of performance issues, with individual tests run slower when parallelized (in particular on the server), the default asynch timeout has been increased from 1 to 10 seconds.