The legal fallout from an alleged wage-fixing conspiracy among aerospace companies, including some based in Connecticut, mounted this week with the filing of yet another class action lawsuit. In a statement, Seattle-based law firm Hagens Berman said it filed an expanded suit Tuesday in federal court on behalf of engineers who were allegedly blocked from moving between companies — and increasing their pay — through illegal “no poaching” agreements, in which executives of competing firms agreed not to hire workers away from each other in order to keep labor costs down.