Fix mistakes in net9 WorkloadManifest.json (#111950)

* Fix mistakes in net9 and current WorkloadManifest.json

I noticed these while working on the workload manifest move to the sdk repo.
We were missing the alias-to for the templates and missed the net9 in the package id for microsoft-net-runtime-macos-net9.

* Revert the template changes

Author: akoeplinger

src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.net9.Manifest/WorkloadManifest.json.in

@@ -115,8 +115,8 @@
       "packs": [
         "Microsoft.NETCore.App.Runtime.Mono.net9.osx-arm64",
         "Microsoft.NETCore.App.Runtime.Mono.net9.osx-x64",
-        "Microsoft.NETCore.App.Runtime.osx-arm64",
-        "Microsoft.NETCore.App.Runtime.osx-x64"
+        "Microsoft.NETCore.App.Runtime.net9.osx-arm64",
+        "Microsoft.NETCore.App.Runtime.net9.osx-x64"
       ],
       "extends": [ "microsoft-net-runtime-mono-tooling-net9" ],
       "platforms": [ "osx-arm64", "osx-x64" ]