PHILADELPHIA — Benefits Data Trust, a Philadelphia nonprofit that helps people overcome barriers to government benefits for food, housing and health care, received a $20 million gift from MacKenzie Scott, the ex-wife of Amazon founder Jeff Bezos, the organization announced Tuesday. The gift allows the group to “energize our thinking around how do we make the challenge of benefits access a thing of the past over the next decade.” said Trooper Sanders, chief executive of Benefits Data Trust. “That’s just an extraordinary moment. It’s both energizing and humbling.” Having learned just several wee…