By Andrew Gray and Charlotte Van Campenhout BRUSSELS/ AMSTERDAM (Reuters) -Donald Trump told top European officials while he was U.S. president that the United States would never help Europe if it came under attack, according to a high-level EU official. Thierry Breton, a French commissioner who is responsible for the European Union’s internal market, said Trump made the remarks to European Commission President Ursula von der Leyen at the World Economic Forum in Davos in January 2020. Breton recounted his recollection of the meeting, which he also attended, at a panel discussion in Brussels on…