fix(gax-internal): keep traces as Unset on success#4967

coryan merged 2 commits intogoogleapis:maingoogleapis/google-cloud-rust:mainfrom

coryan:cleanup-gax-internal-otel-status-defaults-to-unsetcoryan/google-cloud-rust:cleanup-gax-internal-otel-status-defaults-to-unsetCopy head branch name to clipboard