restore vCluster config from snapshot

[neogopher]

What issue type does this pull request address? (keep at least one, remove the others) /kind bugfix

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible) resolves ENG-9486

Please provide a short message that should be published in the vcluster release notes vCluster will now automatically restore the cluster.yaml configuration while restoring from a snapshot

What else do we need to know?

---

[!NOTE] Load Helm release values from snapshot, merge with defaults, use for restore/config parsing, and write to vc-config-* Secret; CLI consumes snapshot values/versions during --restore.

• Restore pipeline:
  • Add snapshot.GetVClusterReleaseFromSnapshot to extract HelmRelease from snapshot.
  • Merge release values with defaults (mergeWithDefaults) and parse config via config.ParseConfigBytes.
  • Initialize clients (InitClients) and use merged config for restore validation.
  • Persist merged values to Secret vc-config-<name> (config.yaml).
  • Refactor createRestoreRequest to use internal o.vConfig.
• CLI (pkg/cli/create_helm.go):
  • Use snapshot.GetVClusterReleaseFromSnapshot to fetch config on --restore.
  • Auto-set cmd.ChartVersion from snapshot release and temp-write values for install/upgrade.

^{Written by Cursor Bugbot for commit 4d888da6cf4fd10778383162001d147b8f1f23e7. This will update automatically on new commits. Configure here.}

[pascalbreuninger]

@claude Please review this PR and suggest improvements

[pascalbreuninger]

bugbot run