WASHINGTON — One of President Joe Biden’s nominees to a federal appeals court has generated rare concern from some Democrats and outside groups over his signature on a legal brief defending a parental notification law in New Hampshire, injecting the issue of abortion into his confirmation fight from an unexpected flank.Michael Delaney, nominated for the 1st U.S. Circuit Court of Appeals, based in Boston, said in written testimony to senators that he did not write the 2005 brief and otherwise had &ldquo …