Add a timeout at the pod level to prevent it running forever

[ravanelli]

Jobs can run indefinitely and block other releases when the cosa pod fails to start or hangs. We recently had a release job running for ~5 days, requiring manual intervention to unblock the pipeline. We should introduce a timeout mechanism to prevent this issue to happen again.

We should add a timeout argument to cosaPod (default: 24h).
https://github.com/coreos/coreos-ci-lib/blob/main/vars/cosaPod.groovy
Override the timeout for debugpod jobs, which may legitimately need longer execution times.