By Steve Holland WASHINGTON (Reuters) – After a pandemic hiatus, President Joe Biden, first lady Jill Biden and Vice President Kamala Harris launched the first White House Easter Egg Roll in two years on Monday, resuming an annual tradition for children that dates back to 1878. “Ready, set, go!” Biden shouted and blew a whistle to begin the festivities, in which children race to roll pastel-colored eggs down a portion of the South Lawn using long-handled spoons. A light rain did nothing to put a damper on an event in which 30,000 children and adults were participating. Many top administration …