President Emmanuel Macron of France says he will formally recognize a Palestinian state as the United Nations General Assembly convenes next week, part of a broad diplomatic push he has spearheaded in an attempt to salvage a two-state solution with Israel that looks as distant as ever. The plan, hatched with the Saudis over the last six months, is meant to provide a road map for rebuilding Gaza and securing a peace after the end of the Gaza war, which is close to entering its third year. It has gained support from 142 countries. Since Mr. Macron announced in July that he would recognize Palestine, more than a half-dozen countries have followed suit, including Canada and Britain, whose prime minister, Keir Starmer, is expected to make his pronouncement this weekend. The rest are expected to make their declarations on Monday during a summit at the United Nations the day before the General Assembly officially opens.