Rewrite lisflood model tests

[sverhoeven]

The download of parameter set (https://github.com/ec-jrc/lisflood-usecases/archive/refs/heads/master.zip) can take a long time (> 4 minutes) as it downloads over 500Mb and is throttled. We should make it quicker by creating a fake parameter set and forcing.

In eWaterCycle/ewatercycle@aa38d0d the tests where marked as skipped. This improved CI from 24 minutes to less than 8 minutes.

[BSchilperoort]

Was this fixed in dbfe5a8 ?

[sverhoeven]

CI seems to run quick <4min, which is ok.

We should remove the TODO at

ewatercycle-lisflood/tests/test_model.py

Line 43 in d43fe44

# TODO the download can take a long time (> 4 minutes)

to make this issue fixed.