Meanwhile, make the dressing. In a small bowl, whisk together the olive oil, lemon juice, mustard, garlic, herbes de Provence, red pepper flakes, and salt. (Note: the dressing will have a strong flavor, it’ll mellow once it coats all of the pasta salad ingredients).
Drain the pasta, toss it with a little olive oil (so that it doesn’t stick together) and let it cool to room temp. Transfer to a large bowl with the tomatoes, chickpeas, arugula, cucumbers, feta cheese, basil, parsley, mint, and pine nuts. Pour the dressing and toss to coat. Season to taste with more lemon, salt, pepper, and/or a drizzle of olive oil, if desired, and serve.