STOCKHOLM—Sweden has halted wide-scale testing for COVID-19 even among people showing symptoms of an infection, putting an end to the mobile city-square tent sites, drive-in swab centers, and home-delivered tests. The move puts the Scandinavian nation at odds with most of Europe, but some experts say it could become the norm as costly testing yields fewer benefits with the easily transmissible but milder Omicron variant and as governments begin to consider treating COVID-19 like they do other endemic illnesses. “We have reached a point where the cost and relevance of the testing is no longer justifiable.” Swedish Public Health Agency chief Karin Tegmark Wisell told the national broadcast SVT this week. “If we were to have extensive testing adapted to everyone who has COVID-19, that would mean half a billion kronor a week [about $55 million] and 2 billion a month [$220 million],” Tegmark Wisell added. Starting Wednesday, only health …