fix(helm/k8s_standard): use metadata object for values output

[unni-facets]

Problem

raptor create iac-module --publish fails terraform validate on outputs.tf:4:

Error: Invalid index
The given key does not identify an element in this collection value.
An object only supports looking up attributes by name, not by numeric index.

Cause

Helm provider v3 changed helm_release.metadata from a list to a single object. The metadata[0] numeric index is no longer valid.

Fix

-    values = jsondecode(helm_release.external_helm_charts.metadata[0].values)
+    values = jsondecode(helm_release.external_helm_charts.metadata.values)

Verification

raptor create iac-module -f . --publish (full validation, no skip) passes:

• 🔍 Terraform validation successful
• ✅ Output types validated successfully
• ✓ Module published (Stage: PUBLISHED) on capillary CP