[WIP] Doc: Kubelet PSI metrics feature graduates to GA

[mariafromano-25]

Description

Update feature status and wording as the feature goes stable.

Issue

Ref: kubernetes/enhancements#4205

Closes: #

[k8s-ci-robot]

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[lmktfy]

/sig node

[lmktfy]

I know this PR is draft, but even so I hope the advice helps.

[lmktfy]

Early feedback: try this

Suggested change

	{{< feature-state for_k8s_version="v1.36" state="stable" >}}
	{{< feature-state feature_gate_name="KubeletPSI" >}}

and then look for instances of KubeletPSI anywhere in the English docs that might need an update.

For other localizations, each localization team - usually 100% volunteers - picks its own way of working.

[lmktfy]

/sig instrumentation