[confmap] Fix for unset env var setting non-string field.#10950

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

TylerHelmuth:confmap-fix-non-string-nil-caseTylerHelmuth/opentelemetry-collector:confmap-fix-non-string-nil-caseCopy head branch name to clipboard