[chore][servicegraphconnector] Add stability level per metric#42991

atoulme merged 6 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-collector-contrib:mainfrom

ChrsMark:servicegraphconnector_metric_stabilityChrsMark/opentelemetry-collector-contrib:servicegraphconnector_metric_stabilityCopy head branch name to clipboard