Handle custom metric suffix in exporter/prometheus to match otel-contrib#6839

dashpole merged 6 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-go:mainfrom

alexandreLamarre:ucum-or-default-suffixalexandreLamarre/opentelemetry-go:ucum-or-default-suffixCopy head branch name to clipboard