By Giulio Piovaccari MILAN (Reuters) -Stellantis is set to delay the unveiling of its new strategic plan to the second quarter of next year to give CEO Antonio Filosa more time to address major uncertainties in the carmaker's key markets. The decision, which Stellantis flagged in an analyst call on Friday, underscores the challenges facing Filosa, who took over in June, as the French-Italian-American automaker grapples with rising trade barriers in the U.S. and evolving regulation in the European Union. ...