By Helen Reid JOHANNESBURG (Reuters) – France’s Renault and U.S. carmaker Rivian have backed a moratorium on deep-sea mining and will exclude seabed metals from their supply chains in a blow to an industry that aims to capitalise on demand from electric vehicle and other industries. French President Emmanuel Macron has said deep seabed exploration was a priority as a way to gain access to “rare metals” and to better understand marine ecosystems. The decision by Renault, in which the French government holds 15.01%, adds pressure on the nascent deep-sea mining industry which aims to extract batt…