Slow Cooker Chicken Noodle Soup

Name: Slow Cooker Chicken Noodle Soup
Ingredients: 8 ounces carrots, sliced 1/4 inch thick (about 3 large carrots); 6 ounces celery, sliced 1/4 inch thick (about 5 large stalks); 1/4 small onion, peeled and root end intact; 2 large sprigs parsley, plus 1/4 cup chopped leaves; 2 large sprigs thyme; 1 bay leaf; Kosher salt; 2 pounds bone-in, skin-on chicken thighs (about 6 thighs); 8 cups low-sodium chicken broth; 6 ounces wide egg noodles (about 4 cups); 1 to 2 tablespoons freshly squeezed lemon juice; Freshly ground black pepper