Add integration tests for get_pipeline_logs

[mathislucka]

Overview

Check out the PipelineResource (in api).
It has a get_logs method but we do not have corresponding integration tests for the method (check in test/integration).

The problem is that a pipeline needs to be deployed so that there are logs.

Therefore, the test setup here is a bit more involved:

• we need to create a valid pipeline
• we need to poll the pipeline status (get pipeline and check status)
• we can get logs once the pipeline status is DEPLOYED

Create integration tests that do this, mark them as "extra-slow" so that we can exclude them when we don't want to wait.

You can put the tests into a new file.