Add a dedicated concept page for Pod Conditions

[kfess]

Description

Add a dedicated concept page for Pod Conditions, gathering information currently spread across the Pod Lifecycle page, disruptions, resize tasks pages.

The newly added page mostly reuses existing text from the source pages, but adds an explanation of why conditions complement Pod phase. Also added a simple yaml example and description about observedGeneration field (GA in v1.35)

Issue

Closes: #55315

Comment

I also checked observedGeneration field exists with kubectl get pods <pod-name> -o yaml in my local environment.

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[lmktfy]

Thanks. I don't know how this works in detail but even so I can provide feedback.

---

Because the Pod lifecycle page already contains errors, IMO we could move this even if the new content also contains a subset of those errors.

[kfess]

Thanks for the quick review. I've updated the PR.

[lmktfy]

/lgtm

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LGTM label has been added.

Details

Git tree hash: c05480b487b44c00a5b85202489eb518ea3558a6