Workload manifests for net11

[lewing]

Add the net10 Manifests for emscripten and mono.

[lewing]

this won't correctly detect installed net11 workloads until dotnet/runtime#121853 lands

[lewing]

As a follow up we should do something like

--- a/src/Workloads/Manifests/Microsoft.NET.Workload.Emscripten.Current.Manifest/WorkloadManifest.json.in
+++ b/src/Workloads/Manifests/Microsoft.NET.Workload.Emscripten.Current.Manifest/WorkloadManifest.json.in
@@ -1,6 +1,12 @@
 {
   "version": "${WorkloadVersion}",
   "workloads": {
+    "microsoft-net-sdk-emscripten-${NetVersion}" : {
+        "abstract": true,
+        "description": "Emscripten SDK compiler tooling for ${NetVersion}.0",
+        "extends": "microsoft-net-sdk-emscripten"
+        "platforms": [ "win-x64", "win-arm64", "linux-x64", "linux-arm64", "linux-musl-x64", "linux-musl-arm64", "osx-x64", "osx-arm64" ]
+    }
     "microsoft-net-sdk-emscripten": {
       "abstract": true,
       "description": "Emscripten SDK compiler tooling for ${NetVersion}.0",

to make it easier to break the circular reference of workload versions on major version bumps.

see dotnet/runtime@f57d1d6 and dotnet/runtime#122264