Global Application Testing Services Market By Type (Onshore Delivery Model, Offshore Delivery Model, Nearshore Delivery Model, Onsite Delivery Model, and Others), By Application (Telecom & IT, BFSI, Healthcare & Life Sciences, Government & Public Sector, Manufacturing, Logistics & Transportation, and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029