[Documentation] Add doc-tests to test workflow to guarantee working examples

[sea212]

When tests are executed, doc-tests for that crate should also be executed. Extended the test job in the associated workflow, such that it will also respect the doc-tests. This can save developers a lot of nerves when trying out our libraries by coping & pasting our examples, since our pipeline will fail when the doc-tests fails and consequently force us to fix the underlying examples.

depends on #265