As people across the country continue to grab at-home, COVID-19 tests off store shelves, Abbott Laboratories — the maker of one of the most popular of those tests — reported a stellar fourth quarter and financial year. The north suburban-based company, which makes the BinaxNOW test and others, sold $2.1 billion worth of rapid COVID-19 tests during the last three months of 2021, the company reported Wednesday. Abbott’s total sales for last year were $43.1 billion, up 22.9%. The company beat estimates and its own earnings-per-share guidance. Abbott has distributed more than 1.4 billion COVID-19 …