“Although some programs may appear neutral on their face, a closer look reveals that they are, in fact, motivated by racial considerations.8 And race-based decision-making, no matter the form, remains impermissible. For example, a school may not use students’ personal essays, writing samples, participation in extracurriculars, or other cues as a means of determining or predicting a student’s race and favoring or disfavoring such students.”