GRAND RAPIDS, Mich. — The largest domestic terrorism trial in recent U.S. history ended with no convictions Friday, delivering a blow to a case about a kidnapping plot targeting Michigan Gov. Gretchen Whitmer that has been dogged by controversy, scandal and the intense focus of a nation grappling with the rise of violent extremism. Jurors acquitted two accused plotters and deadlocked on two alleged ringleaders after defense lawyers raised questions about FBI agents misconduct and informants who were credited with thwarting the plot. The verdicts came one year after the first whiff of trouble i…