feat: publish 'app-staging-synthesizer-alpha' for Go (#34364)

This turns on Go publishing for the
`@aws-cdk/app-staging-synthesizer-alpha` package.

This PR *should* be all that is necessary, given that all other alpha packages are publishing into the same GitHub repo as this one and it already exists. We will monitor during the next release.


----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: rix0rrr

packages/@aws-cdk/app-staging-synthesizer-alpha/package.json

@@ -35,6 +35,10 @@
         "namespace": "Amazon.CDK.AppStagingSynthesizer.Alpha",
         "packageId": "Amazon.CDK.AppStagingSynthesizer.Alpha",
         "iconUrl": "https://raw.githubusercontent.com/aws/aws-cdk/main/logo/default-256-dark.png"
+      },
+      "go": {
+        "moduleName": "github.com/aws/aws-cdk-go",
+        "packageName": "appstagingsynthesizeralpha"
       }
     }
   },