WASHINGTON — Dominion Voting Systems filed a defamation lawsuit on Monday against Donald Trump’s personal lawyer Rudy Giuliani, who led the former president’s efforts to spread baseless claims about the 2020 election.The lawsuit seeks more than $1.3 billion in damages for the voting machine company, a target for conservatives who made up wild claims about the company, blaming it for Trump’s loss and alleging without evidence that its systems were easily manipulated. Dominion is one of the nation …