[Bug] Missing files `modules/retail/metadata-retail.adoc[]` and `modules/travelops/metadata-travelops.adoc`

[gaurav-nelson]

Issue Description:

WARN  patterns/retail/cluster-sizing.adoc: asciidoctor: ERROR: <stdin>: line 7: include file not found: /site/modules/retail/metadata-retail.adoc
WARN  patterns/travelops/cluster-sizing.adoc: asciidoctor: ERROR: <stdin>: line 7: include file not found: /site/modules/travelops/metadata-travelops.adoc

There is no file  at `modules/retail/metadata-retail.adoc` and `modules/travelops/metadata-travelops.adoc`.

Please add the missing pages similar to https://github.com/validatedpatterns/docs/blob/main/modules/federated-edge-observability/metadata-federated-edge-observability.adoc for retail and travelops.

---

Context:

• Page URL: https://validatedpatterns.io/patterns/retail/cluster-sizing/
• GitHub Source File: https://github.com/validatedpatterns/docs/blob/main/patterns/retail/cluster-sizing.adoc