WASHINGTON — Rep. Eric Swalwell, who served as a House manager in Donald Trump’s last impeachment trial, filed a lawsuit Friday against the former president, his son, lawyer and a Republican congressman whose actions he charges led to January’s insurrection.The California Democrat’s suit, filed in federal court in Washington, alleges a conspiracy to violate civil rights, along with negligence, inciting a riot and inflicting emotional distress. It follows a similar suit filed by Rep. Bennie Thompson last month in an …