CalcJobOutputFollower widget error with aiiida-core 2.8

So, the calculation seems to run fine, but the `aiida.out` preview just shows the following:

_Originally posted by @mbercx in https://github.com/aiidalab/aiidalab-docker-stack/issues/482#issuecomment-4326455102_

The widget in question above is in `src/aiidalab_qe/common/widgets.py:CalcJobOutputFollower`. I have a brief look and there's no asyncio code (the code uses threads) so the errors are baffling.

This was reported in https://github.com/aiidalab/aiidalab-docker-stack/pull/482 but is also seen in the current `full-stack:edge` image which has aiida-core 2.8.0.
The big change in aiida-core was to get rid of `nest_asyncio` so perhaps that could be a trigger for this bug? But also could be something entirely different.

I think this is a blocker for releasing a stable (`latest`) image with aiida-core 2.8.0
(CC @cpigneoli who was interested in it)

The first step here should be to confirm that the problem is not present with `latest` image with aiida-core 2.7.3