Aleksei Sviridkin edb3eeb011 fix(info): use root-host for Keycloak OIDC issuer URL in tenant kubeconfig (#2704)
## What this PR does

The kubeconfig generated by the `info` package for non-root tenants
pointed `--oidc-issuer-url` at `keycloak.<TENANT>.<ROOT-DOMAIN>`, but
Keycloak's ingress and cert live at `keycloak.<ROOT-DOMAIN>` (built from
`_cluster.root-host`). `kubectl oidc-login` then failed TLS verification
against the nginx-ingress default fake cert, so the auto-generated
kubeconfig was unusable for any non-root tenant.

`$host` was being sourced from `_namespace.host` (tenant-specific
subdomain) with a lookup-based override that tried to read
`tenant-root`'s `spec.values.host`. That override has been dead since
#1787 migrated `tenant-root` to `valuesFrom` (Secret-backed) —
`spec.values` is now always empty, so the override never fires.

Source `$host` from `_cluster.root-host` directly, matching what
`packages/system/dashboard/templates/gatekeeper.yaml` already does for
the same Keycloak realm.

Verified with `helm template tenant1 packages/extra/info -n
tenant-tenant1 --set-string _namespace.host=tenant1.example.org
--set-string _cluster.root-host=example.org ...` — issuer URL is now
`https://keycloak.example.org/realms/cozy` regardless of the
per-namespace host.

### Release note

```release-note
fix(info): use root-host for the Keycloak OIDC issuer URL in tenant kubeconfigs so `kubectl oidc-login` succeeds against the real Keycloak cert on non-root tenants
```


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## Summary by CodeRabbit

* **Chores**
* Updated kubeconfig generation to consolidate host configuration
handling, now using a single authoritative source instead of multiple
fallback mechanisms.

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