Rub the chicken and duck carcasses in vegetable oil and brown in a large stock pot over medium-high heat. Reduce to medium heat and add the celery, onions, carrots, and water. Let simmer on medium heat for 1 hour. Add rosemary, thyme, parsley, mushrooms and noodles, and simmer for an additional 30 minutes. Season with salt and pepper. Ladle soup into bowls and serve with noodles.