Python: Fixes Run ID and Thread ID casing to align with AG-UI Typescript SDK#2948

eavanvalkenburg merged 2 commits intomicrosoft:mainmicrosoft/agent-framework:mainfrom

howlowck:fix/ag-ui-run-id-thread-idhowlowck/agent-framework:fix/ag-ui-run-id-thread-idCopy head branch name to clipboard