Setting the visibility on new services to be only visible on PREPROD

Reviewed-by: tischrei <tino.schreiber@t-systems.com>
Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>

otc_metadata/data/services.yaml

@@ -214,14 +214,16 @@ documents:
     service_type: cts
     title: User Guide
     type: umn
-  - html_location: docs/dbss/api-ref
+  - environment: internal
+    html_location: docs/dbss/api-ref
     link: /database-security-service/api-ref/
     pdf_name: dbss-api-ref
     rst_location: api-ref/source
     service_type: dbss
     title: API Reference
     type: api-ref
-  - html_location: docs/dbss/umn
+  - environment: internal
+    html_location: docs/dbss/umn
     link: /database-security-service/umn/
     pdf_name: dbss-umn
     rst_location: umn/source
@@ -492,14 +494,16 @@ documents:
     service_type: elb
     title: User Guide
     type: umn
-  - html_location: docs/er/api-ref
+  - environment: internal
+    html_location: docs/er/api-ref
     link: /enterprise-router/api-ref/
     pdf_name: er-api-ref
     rst_location: api-ref/source
     service_type: er
     title: API Reference
     type: api-ref
-  - html_location: docs/er/umn
+  - environment: internal
+    html_location: docs/er/umn
     link: /enterprise-router/umn/
     pdf_name: er-umn
     rst_location: umn/source