A CNN panel made a dark joke Friday night that vetting for top presidential administrations is an old-school mentality. Former Fox News host Gretchen Carlson told anchor Anderson Cooper that she believes Elon Musk will be the “single most important and influential person” in the Trump administration, following reports the tech billionaire joined a call with President-elect Donald Trump and Ukraine President Volodymyr Zelenskyy. “He is in charge now of the information flow with X — or misinformation, sometimes — he is in charge as we saw with what’s going on with Ukraine. He’s basically in char…