LONDON/DUBLIN (Reuters) -Legislation allowing Britain to scrap some of the rules on post-Brexit trade with Northern Ireland on Monday passed the first of many parliamentary tests, as Prime Minister Boris Johnson pressed on with plans that have angered the European Union. Despite some fierce criticism, lawmakers voted 295 to 221 in favour of the Northern Ireland Protocol Bill, which would unilaterally overturn part of Britain’s divorce deal from the EU agreed in 2020. The bill now proceeds to line-by-line scrutiny. Tensions with the EU have simmered for months after Britain accused Brussels of …