Fix CI by replacing conda with poetry and add init files to dhydamo modules

[priscavdsluis]

In this PR:

1. Use poetry instead of conda for installing the environment
2. Add init.py files to the dhydamo modules, so that the tests can find them
3. Comment out the CI workflow step: "Autoformat code if the check fails". Because the CI is fixed, this step was executed again, meaning that if people do an update from the main they probably will have conflicts. Decided with @arthurvd to reenable this step again at a proper time.

[sonarcloud[bot]]

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