[exporter/datadog] Refactor WaitGroup into separate fields for traces and metrics exporter#33291

codeboten merged 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-collector-contrib:mainfrom

liustanley:stanley.liu/refactor-wgliustanley/opentelemetry-collector-contrib:stanley.liu/refactor-wgCopy head branch name to clipboard