Change the format of tool exceptions and NuGet API exceptions to be graceful

src/Cli/Microsoft.DotNet.Cli.Utils/GracefulException.cs

@@ -8,6 +8,10 @@ public class GracefulException : Exception
         public bool IsUserError { get; } = true;
         public string VerboseMessage { get; } = string.Empty;
 
+        public GracefulException()
+        {
+        }
+
         public GracefulException(string message) : base(message)
         {
             Data.Add(ExceptionExtensions.CLI_User_Displayed_Exception, true);

src/Cli/dotnet/NugetPackageDownloader/NuGetPackageDownloader.cs

@@ -450,10 +450,9 @@ await Task.WhenAll(
                 throw new NuGetPackageNotFoundException(
                     string.Format(
                         LocalizableStrings.IsNotFoundInNuGetFeeds,
-                        $"{packageIdentifier}::{versionRange}",
+                        $"{packageIdentifier} of version range {versionRange}",
                         string.Join(", ", packageSources.Select(source => source.Source))));
             }
-
         }
 
             private async Task<(PackageSource, IPackageSearchMetadata)> GetLatestVersionInternalAsync(

src/Cli/dotnet/NugetPackageDownloader/ToolPackageException.cs

@@ -1,9 +1,11 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using Microsoft.DotNet.Cli.Utils;
+
 namespace Microsoft.DotNet.Cli.NuGetPackageDownloader
 {
-    internal class NuGetPackageInstallerException : Exception
+    internal class NuGetPackageInstallerException : GracefulException
     {
         public NuGetPackageInstallerException()
         {

src/Cli/dotnet/ToolPackage/ToolPackageException.cs

@@ -1,9 +1,10 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
+using Microsoft.DotNet.Cli.Utils;
 
 namespace Microsoft.DotNet.ToolPackage
 {
-    internal class ToolPackageException : Exception
+    internal class ToolPackageException : GracefulException
     {
         public ToolPackageException()
         {