fix: Wire tags parameter in main.parameters.json for azd env support

The tags parameter was defined in main.bicep but not mapped in
main.parameters.json, so users could not pass custom tags via
azd env set AZURE_TAGS. This is needed to support SFI policy
bypass by setting Securitycontrol:Ignore tag on the resource group
before Event Hub creation (which requires local auth enabled).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Yamini-Microsoft

infra/main.parameters.json

@@ -10,6 +10,9 @@
     },
     "existingFabricCapacityName": {
       "value": "${EXISTING_FABRIC_CAPACITY_NAME}"
+    },
+    "tags": {
+      "value": "${AZURE_TAGS}"
     }
   }
 }