Wait container is terminated with wrong command

[alexec]

In v3.4 we still try to terminate using /bin/sh but we need to introduce argoexec kill instead.

https://github.com/argoproj-labs/argo-dataflow/blob/8fbb255c01e744b6331faa269c96d8558b71e15a/kill/kill.go#L21

This will work for all cases now.

signalContainers will exit on the first error running SignalContainer. It should instead continue or error, otherwise killContainers will never be invoked.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this is a mentoring request, please provide an update here. Thank you for your contributions.