PITTSFIELD — The state agency that oversees workforce development in the Berkshires has received a $235,000 grant to provide additional training opportunities in the county’s largest job sector. The MassHire Berkshire Workforce Board plans to use the funding to support the development and management of health care training programs in Berkshire County over the next two years. Health care/social assistance is the Berkshire’s largest job sector, with 11,500 employees, according to the workforce board’s website. Berkshire Health Systems is the county’s largest employer.