issue: tests for some services time out, no reports send

[steffyP]

The route53 tests are not running anymore, e.g. the test container is canceled after 6hours, and we do not receive any reports of the test results anymore.

We should:

• identify which of the tests is causing the timeout,
• either exclude the test or split the tests into several parts (like we already do with other tests).

[alexrashed]

This now also happens to S3. We could maybe fix these issues by using https://pypi.org/project/pytest-split/ (per service). This would also have the benefit that new tests are not overlooked (currently the partitioning lists the tests, which is not automatically updated).