LOS ANGELES -- If Mandy Moore is bracing for emotional whiplash, it’s understandable.She and her musician-husband, Taylor Goldsmith, welcomed their first child in February, an event she says that turned her world “Technicolor,” and the pair collaborated on an upcoming second album.The cloud ahead: The end of “This Is Us,” the NBC drama that she says proved a “dream on every single level,” from her co-stars to the consistently challenging work.