fix(build): correct GitHub Packages download URL format

- Add missing package ID to GitHub Packages URL path
- Fix download URL generation for LocalStack packages on GitHub Packages
- URL format: https://github.com/owner/repo/packages/nuget/PackageId

Author: Blind-Striker

build/LocalStack.Build/CakeTasks/Nuget/Services/PackageOperations.cs

@@ -190,7 +190,7 @@ private static string GetDownloadUrl(string packageSource, string packageId, str
     {
         return packageSource switch
         {
-            BuildContext.GitHubPackageSource => $"https://github.com/localstack-dotnet/localstack-dotnet-client/packages",
+            BuildContext.GitHubPackageSource => $"https://github.com/localstack-dotnet/localstack-dotnet-client/packages/nuget/{packageId}",
             BuildContext.NuGetPackageSource => $"https://www.nuget.org/packages/{packageId}/{version}",
             BuildContext.MyGetPackageSource => $"https://www.myget.org/packages/{packageId}/{version}",
             _ => "Unknown package source"

test-output.txt

@@ -0,0 +1 @@
+client-version=2.0.0-url-test