Seared Steak with Sesame Noodle Salad

Name: Seared Steak with Sesame Noodle Salad
Ingredients: 1 tsp. Kosher salt, plus more to taste; 8 oz. spaghetti or other thin noodles; 5 tbsp. vegetable oil; 6 tbsp. low-sodium soy sauce; 3 cloves garlic, minced; 1 1/2 tbsp. rice vinegar; 1 1/2 tbsp. toasted sesame oil; 1 tbsp. sugar; 1/4 tsp. red pepper flakes; 1 10-ounce package shredded red cabbage; 1/2 English cucumber, cut into thin matchsticks (about 1 cup); 4 boneless strip steaks (about 1/2 inch thick; 2 1/4 pounds total); 1 tsp. black pepper; 2 scallions, thinly sliced