🚸 Reduce runtime of tests for CI

[burgholzer]

Environment information

CI

Description

Currently, the tests that are being run in CI take rather long; to a degree where it is sometimes annoying to wait for CI when working on some feature.

Expected behavior

The test runtime in CI should be somewhat reasonable, like in the ball park of ~5min or even less.
We should be able to trim down the tests a little bit while not loosing coverage.

How to Reproduce

Watch CI run :o)