frontend: align duration formatting with apimachinery logic

[ChayanDass]

Summary

Align frontend duration/age formatting with Kubernetes apimachinery behavior.

Related Issue

Fixes headlamp-k8s/plugins#485 -> duration issue

Changes

• Replaced humanize-duration based age formatting in frontend/src/lib/util.ts.
• Implemented Kubernetes-style logic equivalent to:
  • ShortHumanDuration for compact age values.
  • HumanDuration for slightly more detailed duration values.
• Updated formatDuration() to use the new internal formatter functions.

Why

This makes Age/Duration output consistent with Kubernetes conventions and avoids mismatches in relative time rendering.

Steps to Test

1. Open resource list views that show Age (for example Pods, Deployments, Jobs).
2. Verify compact age values render in Kubernetes-like format (s, m, h, d, y).
3. Check places using mini/expanded duration formatting still display correctly.

Screenshots

[k8s-ci-robot]

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