Use WorkloadId type for Id on WorkloadInfo

IIRC WorkloadId used to be private but now it's public there's no
reason not to use it

Author: mhutch

src/Resolvers/Microsoft.NET.Sdk.WorkloadManifestReader/WorkloadId.cs

@@ -32,5 +32,7 @@ public WorkloadId(string id)
         public override bool Equals(object? obj) => obj is WorkloadId id && Equals(id);
 
         public override string ToString() => _id;
+
+        public static implicit operator string(WorkloadId id) => id._id;
     }
 }

src/Resolvers/Microsoft.NET.Sdk.WorkloadManifestReader/WorkloadResolver.cs

@@ -422,7 +422,7 @@ public ISet<WorkloadInfo> GetWorkloadSuggestionForMissingPacks(IList<string> pac
 
             return new HashSet<WorkloadInfo>
             (
-                finder.GetBestSuggestion().Workloads.Select(s => new WorkloadInfo(s.ToString(), _workloads[s].workload.Description))
+                finder.GetBestSuggestion().Workloads.Select(s => new WorkloadInfo(s, _workloads[s].workload.Description))
             );
         }
 
@@ -538,21 +538,21 @@ public PackInfo(string id, string version, WorkloadPackKind kind, string path, s
 
         public class WorkloadInfo
         {
-            public WorkloadInfo(string id, string? description)
+            public WorkloadInfo(WorkloadId id, string? description)
             {
                 Id = id;
                 Description = description;
             }
 
-            public string Id { get; }
+            public WorkloadId Id { get; }
             public string? Description { get; }
         }
 
         public WorkloadInfo GetWorkloadInfo(WorkloadId WorkloadId)
         {
             if (_workloads.TryGetValue(WorkloadId) is (WorkloadDefinition workload, _))
             {
-                return new WorkloadInfo(workload.Id.ToString(), workload.Description);
+                return new WorkloadInfo(workload.Id, workload.Description);
             }
             throw new Exception("Workload not found");
         }