Container age is same for all containers in pod

[ryanbrainard]

Describe the bug
The AGE column for Containers is calculated from po.GetCreationTimestamp(), which means it is the same for all containers in a pod since it's actually showing the pod's age instead of the containers' ages.

To Reproduce
Steps to reproduce the behavior:

1. Go to any pod with multiple containers. Even better if they have init containers, which are more likely to have different start times.
2. View the AGE column
3. All the containers will have the same age. Compare this with the YAML where it shows they actually have different start times in the InitContainerStatuses and ContainerStatuses.

Expected behavior
Instead, I think AGW should be calculated from the po.Status.ContainerStatuses[index].State.Running.StartedAt or po.Status.ContainerStatuses[index].State.Terminated.StartedAt, and null when po.Status.ContainerStatuses[index].State.Waiting != nil`.

For init containers, it should useInitContainerStatuses and limit the age to FinishedAt in the case of a terminated init container.

Screenshots
Current Behavior:

Desired Behavior:

Versions (please complete the following information):

• OS: OSX
• K9s Rev: v0.32.5
• K8s Rev: v1.28.12-eks-2f46c53