Fixing files with few typing (mypy) errors

[henrikmidtiby]

Overview: What does this pull request change?

In this pull request I have addressed some of the files with only a few reported mypy errors.

Further Information and Comments

To identify files with few mypy errors, I cleared the mypy.ini file so no detected errors would be ignored and then used the follwing command

uv run pre-commit run mypy --all-files | grep "error" | sed 's/:.*//' | uniq -c | sort -n -r

I hope that this approach will make it easier to deal with the large files that needs a lot of type annotations added.

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested