Continuous logs from spawned commands

[tdmanv]

KubeTask and KubeExec currently only print logs after completion and for failures don't print anything. This makes it difficult to determine what happened during execution.

[tdmanv]

KubeTask and several other Functions use PodRunner:

kanister/pkg/kube/pod_runner.go

Line 27 in d1228b3

type PodRunner struct {

.

I think it makes sense to consolidate log handling into this package.

We use PodRunner in the following Functions: https://github.com/kanisterio/kanister/search?l=Go&q=NewPodRunner&type=

Many of these Functions do the following:

1. Wait for the pod to be ready
2. Wait for the to complete
3. Collect logs
4. Parse output

This functionality can be improved and pushed into PodRunner.

[github-actions]

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