By Ben Klayman and David Shepardson DETROIT/WASHINGTON (Reuters) – Chrysler parent Stellantis on Friday said it will indefinitely halt operations at an assembly plant in Illinois in February, citing the rising costs to shift to electric vehicles. The Italian-American automaker, which employs about 1,350 workers at the Belvidere, Illinois, plant that builds the Jeep Cherokee SUV, said the action will result in indefinite layoffs and added it may not resume operations as it considers other options. The United Auto Workers union vowed to fight back against the announcement. The company said the a…