REQ: Add post mortem logs in case cluster-up failed

[oshoval]

Is your feature request related to a problem? Please describe:
Upon Kubevirtci cluster-up failures we don't have logs, such as kubectl pods, logs, describe etc

example https://prow.ci.kubevirt.io/view/gs/kubevirt-prow/pr-logs/pull/kubevirt_kubevirt/13282/pull-kubevirt-e2e-k8s-1.30-ipv6-sig-network/1859255594477686784

16:41:01: Waiting on istio operator to become ready failed after maximum retries: Istio operator failed to move to Healthy status after max retries
16:41:02: /home/prow/go/src/github.com/kubevirt/kubevirt/kubevirtci/cluster-up/up.sh: line 34: pop_var_context: head of shell_variables not a function context
make: *** [Makefile:163: cluster-up] Error 1

Describe the solution you'd like:
Would be good to have collected artifacts on CI in case the cluster-up itself failed.

We need for example the following commands:
kubectl get pods -A
for each pod, we need please the kubectl describe, and the logs (for each of its containers)
Or whatever crucial info that we find beside that on the fly.

Describe alternatives you've considered:

Additional context:
Note that we do have some logs collecting as far as i remember, need to adapt / see if something miss.
(they are mostly about the docker BM containers, not the pods)

[oshoval]

/cc @brianmcarey

[aerosouund]

@oshoval
Yes, i think this is a great suggestion and was a pain point for me in kubevirtci while developing
I will investigate how it can be approached

[oshoval]

kubevirt/ipam-extensions#57

some code here might help (especially if you use go style)

[oshoval]

Btw two more things that we can open issues for if desired:

1. Once a cluster fails
   it will try to do some operations and we will see this error that we can stop the flow before that, to reduce noise

Neither --kubeconfig nor --master was specified.  Using the inClusterConfig.  This might not work.

2. This error happens once a cluster fails, and also can be fixed

16:41:02: /home/prow/go/src/github.com/kubevirt/kubevirt/kubevirtci/cluster-up/up.sh: line 34: pop_var_context: head of shell_variables not a function context

Thanks