LONDON — Two climate protesters were arrested Wednesday for spraying orange paint on the ancient Stonehenge monument in southern England, police said. The latest act by Just Stop Oil was quickly condemned by Prime Minister Rishi Sunak as a “disgraceful act of vandalism.” The incident came just a day before thousands are expected to gather at the 4,500-year-old stone circle to celebrate the summer solstice — the longest day of the year in the Northern Hemisphere. [time-brightcove not-tgx=”true”] English Heritage, which manages the site, said it was “extremely upsetting” and said curators were investigating the damage.