By Eva Mathews and Helen Coster (Reuters) -Warner Bros Discovery said on Tuesday it added about 2 million paid streaming subscribers in the first quarter, at a time when industry pioneer Netflix lost subscribers for the first time in more than a decade. In the first set of results from the media giant forged by a $43 billion merger between Discovery Inc and AT&T Inc’s WarnerMedia assets, the TLC and Eurosport channel owner said quarterly revenue rose 13% to $3.16 billion, helped by a rebound in ad spending and the Beijing Winter Olympics. The results did not include figures for WarnerMedia, ho…