[release] Core stable release 1.15.1 updates#7010

Kielek merged 2 commits intomainopen-telemetry/opentelemetry-dotnet:mainfrom

otelbot/post-stable-core-1.15.1-updateopen-telemetry/opentelemetry-dotnet:otelbot/post-stable-core-1.15.1-updateCopy head branch name to clipboard