WASHINGTON — President Joe Biden on Tuesday unveiled his first slate of judicial nominees, a racially diverse and mostly female field that is a sharp departure from the largely white and male picks during Donald Trump’s administration.Biden’s list puts three Black women on federal courts of appeals, a pathway to the Supreme Court. The most prominent of the three is U.S. District Court Judge Ketanji Brown Jackson, whom Biden says he will nominate to the seat left vacant on the U.S. Court of Appeals for the D.C. Circuit by …