[processor/datadogsemantics] Make defaults explicit and add test#39596

mx-psi merged 5 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-collector-contrib:mainfrom

IbraheemA:ibraheem/surface-defaults-in-ddsemanticsprocessorIbraheemA/opentelemetry-collector-contrib:ibraheem/surface-defaults-in-ddsemanticsprocessorCopy head branch name to clipboard