[release/9.5] Fix globalPackagesFolder path to be platform-agnostic in NuGetConfigMerger (#11626)

* Initial plan

* Fix globalPackagesFolder path to be platform-agnostic

Co-authored-by: mitchdenny <513398+mitchdenny@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mitchdenny <513398+mitchdenny@users.noreply.github.com>

Author: 3 people

src/Aspire.Cli/Packaging/NuGetConfigMerger.cs

@@ -980,7 +980,7 @@ private static void AddGlobalPackagesFolderConfiguration(XElement configuration)
             // Add globalPackagesFolder configuration
             var globalPackagesFolderAdd = new XElement("add");
             globalPackagesFolderAdd.SetAttributeValue("key", "globalPackagesFolder");
-            globalPackagesFolderAdd.SetAttributeValue("value", ".nuget\\packages");
+            globalPackagesFolderAdd.SetAttributeValue("value", ".nugetpackages");
             config.Add(globalPackagesFolderAdd);
         }
     }

tests/Aspire.Cli.Tests/Packaging/PackagingServiceTests.cs

@@ -221,7 +221,7 @@ public async Task NuGetConfigMerger_WhenChannelRequiresGlobalPackagesFolder_Adds
 
         var configContent = await File.ReadAllTextAsync(nugetConfigPath);
         Assert.Contains("globalPackagesFolder", configContent);
-        Assert.Contains(".nuget\\packages", configContent);
+        Assert.Contains(".nugetpackages", configContent);
 
         // Verify the XML structure
         var doc = XDocument.Load(nugetConfigPath);
@@ -231,6 +231,6 @@ public async Task NuGetConfigMerger_WhenChannelRequiresGlobalPackagesFolder_Adds
         var globalPackagesFolderAdd = configSection.Elements("add")
             .FirstOrDefault(add => string.Equals((string?)add.Attribute("key"), "globalPackagesFolder", StringComparison.OrdinalIgnoreCase));
         Assert.NotNull(globalPackagesFolderAdd);
-        Assert.Equal(".nuget\\packages", (string?)globalPackagesFolderAdd.Attribute("value"));
+        Assert.Equal(".nugetpackages", (string?)globalPackagesFolderAdd.Attribute("value"));
     }
 }