After a nearly two-decade run as a family-owned business producing and distributing local artisan cheeses, Point Reyes Station’s Cowgirl Creamery and its Petaluma-based wholesale distributor, Tomales Bay Foods, were sold last Friday to a large Swiss dairy company called Emmi. Cowgirl marks the latest in a string of artisan cheese companies in California acquired by Emmi, which last year netted sales more than $3.3 billion and will assume full control of the creamery by the…