[ST] System tests should collect init-container logs for failed tests

[scholzj]

Some of the System Tests using things such as node ports or rack awareness rely on the use of init-containers. But when the system test fails, the logs from the init containers are not collected. This would be a useful enhancement to collect them if the init container was used.

[see-quick]

Yeah, this seems reasonable 👍 .

[scholzj]

Discussed on the community call on 18.4.: Makes sense and should be done.