More than $4 billion has flowed from City Hall to scandal-tarred shelter operators over the last eight years, accounting for more than a quarter of the money spent by the Big Apple to tackle its homelessness crisis, an examination of city records reveals. The $4.6 billion in contract identified by the Post account for 29 percent of the $15.8 billion in contracts let by the Department of Homeless Services over Mayor Bill de Blasioâs nearly eight years in office. The money has gone out to more than half a dozen shelter operators â including the embattled CORE Services Group â...