[rc2] Fix dotnet-ef migrations bundle command on Linux (#36750)

Fixes #36142

Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

Author: Copilot

src/dotnet-ef/RootCommand.cs

@@ -91,7 +91,8 @@ protected override int Execute(string[] _)
             Path.GetDirectoryName(typeof(Program).Assembly.Location)!,
             "tools");
 
-        var targetDir = Path.GetFullPath(Path.Combine(startupProject.ProjectDir!, startupProject.OutputPath!));
+        var targetDir = Path.GetFullPath(Path.Combine(startupProject.ProjectDir!, startupProject.OutputPath!))
+            .Replace('\\', Path.DirectorySeparatorChar);
         var targetPath = Path.Combine(targetDir, project.TargetFileName!);
         var startupTargetPath = Path.Combine(targetDir, startupProject.TargetFileName!);
         var depsFile = Path.Combine(