For decades, GlobalFoundries’ factory in Essex Junction has pumped out computer chips. With over 2,000 employees, the company is Vermont’s largest private, for-profit employer. Now, there’s a worldwide chip shortage leading to more business for the plant, which has seen its workforce shrink significantly from its heyday. But the company is investing more heavily in a facility over the New York border, leading some local leaders to question the company’s long-term commitment to Vermont.