chore(examples): refresh longhorn example to v1.11.2

[acald-creator]

Description

Updates the examples/longhorn package from the legacy v1.4.0 setup to current Longhorn v1.11.2, and replaces the old environment check script flow with longhornctl preflight checks.

Changes

• Bump Longhorn package/chart versions:
  • metadata.version -> 1.11.2
  • charts[].version -> 1.11.2
• Replace longhorn-environment-check component with longhornctl
  • Download longhornctl binary from the v1.11.2 release
  • Update onDeploy to run:
    • ./longhornctl check preflight
• Regenerate pinned images: list for the updated chart/image set
• Refresh examples/longhorn/values.yaml to minimal K3s override only

Validation

./build/zarf package create examples/longhorn -o build -a amd64 --confirm

build/zarf-package-longhorn-amd64-1.11.2.tar.zst

Related Issue

Fixes #4875

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[netlify]

✅ Deploy Preview for zarf-docs canceled.

Name	Link
🔨 Latest commit	0a25bf3
🔍 Latest deploy log	https://app.netlify.com/projects/zarf-docs/deploys/6a0fcd8d10808b0008bc6011

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.