Tens of millions of workers across the U.S. are in limbo as federal courts have issued different rulings related to President Joe Biden’s COVID-19 vaccine mandates for larger private companies, certain health care workers and federal government contractors.A federal appeals court panel has allowed a vaccine requirement for employers with 100 or more workers, although Republican attorneys general, business associations and conservative groups have appealed to the U.S. Supreme Court.A vaccine mandate for companies that …