Fix Delwaq CI

[visr]

I hoped #1664 would fix it, but it did not.
#1649 may also be related.
Delwaq seems to segfault, so not really a helpful error there.

[deltamarnix]

The error that I see is QGIS plugin manager breaking down because it cannot decode some character. I think we should not install QGIS and its plugins for testing DELWAQ.

[Jingru923]

I tried to run without QGIS plugin by pixi run install-ci, the pipeline returns error during unit testing

Pixi task (delwaq in dev): pytest python/ribasim/tests/test_delwaq.py

If digging deeper, there is this error: forrtl: severe (157): Program Exception - access violation
This might be that delwaq trying to access a location on teamcity that is not accessible, or delwaq code is broken and fail the unit tests. We should try to run delwaq locally and see if it's still error free

For more information on the error, you can look into the TC build on the branch fix-dw-ci

[evetion]

Had a nice investigation with @mKlapwijk about this. Turns out that newer Delwaq versions crash on logging to screen in specific cases (ours, and laptop, but not on their TC projects!): https://issuetracker.deltares.nl/browse/DELWAQ-881. For now, I'll revert to an older Delwaq version, we can expect that the next (weekly) pinned build of Delwaq has workarounded/fixed this issue.