UI: restore User Data label rendering in details view

[Copilot]

The details panel for User Data resources could render an empty/missing label after recent terminology key changes (label.userdata vs label.user.data). This PR aligns label resolution with current i18n keys so User Data labels display correctly.

Fixes apache#13244

• Details tab label resolution

  • Updated DetailsTab.vue to handle the userdata route + userdata field explicitly with label.user.data.
  • Preserved existing cniconfiguration behavior and generic fallback logic.

• Focused regression coverage

  • Added DetailsTab.spec.js to validate route-specific label rendering:
    • userdata route renders User Data
    • cniconfiguration route renders CNI Configuration

<strong>{{ item === 'service' ? $t('label.supportedservices') :
  $route.meta.name === 'userdata' && item === 'userdata' ? $t('label.user.data') :
  $route.meta.name === 'cniconfiguration' && item === 'userdata' ? $t('label.' + String($route.meta.name).toLowerCase()) :
  $t(getDetailTitle(item)) }}</strong>

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[DaanHoogland]

@blueorangutan ui