test: normalize project reference paths across platforms

backend/tests/Monitor.Backend.Tests/ArchitectureTests.cs

@@ -36,10 +36,13 @@ public sealed class ArchitectureTests
                     Path.GetFileNameWithoutExtension(path),
                     path,
                     Path.GetDirectoryName(path)!,
-                    [.. items.Where(e => e.Name == "ProjectReference").Select(e => Path.GetFileNameWithoutExtension((string?)e.Attribute("Include") ?? ""))],
+                    [.. items.Where(e => e.Name == "ProjectReference").Select(e => Path.GetFileNameWithoutExtension(NormalizePath((string?)e.Attribute("Include") ?? "")))],
                     [.. items.Where(e => e.Name == "PackageReference").Select(e => (string?)e.Attribute("Include") ?? "")]);
             })];
 
+    private static string NormalizePath(string path) =>
+        path.Replace('\\', Path.DirectorySeparatorChar).Replace('/', Path.DirectorySeparatorChar);
+
     private static bool IsTest(Project p) => p.Path.Contains(Path.DirectorySeparatorChar + "tests" + Path.DirectorySeparatorChar, StringComparison.Ordinal);
 
     private static bool IsFleet(Project p) => p.Name.StartsWith("Fleet.", StringComparison.Ordinal) && !IsTest(p);