Include pod metadata in must-gather output

[black-dragon74]

This PR adds support of fetching the pod metadata
using the kubernetes API.

An additional pod-metadata.json file is created in the report with the dump of entire metadata for the pod.

A much simpler debug log stating the image version being used is printed to the console as well.

The image details are printed to console like:

[must-gather      ] OUT 2024-08-07T15:21:19.386616439Z namespace/openshift-must-gather-8452x created
[must-gather      ] OUT 2024-08-07T15:21:19.39445305Z clusterrolebinding.rbac.authorization.k8s.io/must-gather-jkbhm created
[must-gather      ] OUT 2024-08-07T15:21:19.429835897Z pod for plug-in image quay.io/niryadav/odf-must-gather:infot7 created
[must-gather-2d5hn] POD 2024-08-07T15:21:26.932423529Z volume percentage checker started.....
[must-gather-2d5hn] POD 2024-08-07T15:21:26.968008955Z volume usage percentage 0
[must-gather-2d5hn] POD 2024-08-07T15:21:27.126271465Z must-gather is using image: quay.io/niryadav/odf-must-gather:infot7 <==========================

Since we are fetching the pod details we can also have a JSON file say pod-metadata.json which will be a JSON dump of kubectl get pod <mg-pod>

❯ cat gather-debug.log | grep image
must-gather is using image: quay.io/niryadav/odf-must-gather:infot7

❯ cat pod-metadata.json | grep -o '"image": "[^"]*"' | head -n 1
"image": "quay.io/niryadav/odf-must-gather:infot7"

This feature is requested by BZ: 2290500

Regards

[black-dragon74]

/cherry-pick release-4.17

[openshift-cherrypick-robot]

@black-dragon74: once the present PR merges, I will cherry-pick it on top of release-4.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.17

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[black-dragon74]

@yati1998 PTAL

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: black-dragon74, yati1998

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[openshift-cherrypick-robot]

@black-dragon74: new pull request created: #189

In response to this:

/cherry-pick release-4.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.