Jon Burlingame Celeste’s contribution to the Golden Globe-nominated song “Hear My Voice” started with WhatsApp messages recorded in her bathroom.That’s just one of the revelations in a half-hour conversation with the U.K.’s latest singing sensation, her co-writer Daniel Pemberton and the legendary Sir Elton John, released today by “The Trial of the Chicago 7” distributor Netflix.“Hear My Voice” concludes the Aaron Sorkin film about the controversial 1969 court case involving Tom Hayden (Eddie