Bump the k8s integration test timeout to 15m
I've seen this test/job timeout enough times that I must do something about it. e.g. https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/3482138954 From the trace, I believe it's go itself timing out:
panic: test timed out after 10m0s
not gitlab.
Edited by Axel von Bertoldi