feat: Make cloud-router module ADC compliant

This change updates the blueprint to be compliant with the Application Design Center.

Key changes:
- Updated metadata.yaml files to include output types.
- Added connection metadata for network, router, and vpn_tunnel inputs.
- Added titles to display metadata to pass linting checks.
- Enabled blueprint metadata validation in the CI pipeline.

Author: yuktatechgog

metadata.yaml

@@ -20,6 +20,7 @@ metadata:
     config.kubernetes.io/local-config: "true"
 spec:
   info:
+    title: "Cloud Router"
     title: "Cloud Router"
     source:
       repo: https://github.com/terraform-google-modules/terraform-google-cloud-router.git