[Static Web Assets] Expose endpoint manifest type (#43167)

Author: javiercn

src/StaticWebAssetsSdk/Tasks/Data/StaticWebAssetEndpointsManifest.cs

@@ -7,5 +7,7 @@ public class StaticWebAssetEndpointsManifest()
 {
     public int Version { get; set; }
 
+    public string ManifestType { get; set; }
+
     public StaticWebAssetEndpoint[] Endpoints { get; set; }
 }

src/StaticWebAssetsSdk/Tasks/GenerateStaticWebAssetEndpointsManifest.cs

@@ -56,6 +56,7 @@ public override bool Execute()
             var manifest = new StaticWebAssetEndpointsManifest()
             {
                 Version = 1,
+                ManifestType = ManifestType,
                 Endpoints = [.. filteredEndpoints]
             };