Add documentation link ref to RBAC custom role in Azure Benchmark wizard (#2204)

Fixes OPS-4089

## Additional Notes
<img width="481" height="380" alt="Screenshot 2026-04-08 at 11 39 54 AM"
src="https://github.com/user-attachments/assets/680ee259-b0fe-4ed4-b939-44a35f62bf03"
/>

Author: ravikiranvm

packages/server/api/src/app/benchmark/providers/azure/azure.json

@@ -4,7 +4,7 @@
     {
       "id": "connection",
       "title": "Choose the Azure connection you want to use",
-      "description": "OpenOps can pull data from Azure using the connection you select here.",
+      "description": "OpenOps can pull data from Azure using the connection you select here. We provide Azure RBAC custom role definitions (Bicep or JSON) you can deploy for the required read-only permissions.\n\nRBAC custom role: [OpenOps Azure Benchmark Reader](https://docs.openops.com/cloud-access/azure-rbac#openops-azure-benchmark-reader)",
       "selectionType": "single",
       "optionsSource": { "type": "dynamic", "method": "listConnections" },
       "nextStep": "subscriptions"