fix: prevent OTel context leak in fire-and-forget background tasks#5168

cdoern merged 8 commits intollamastack:mainllamastack/llama-stack:mainfrom

iamemilio:fix/otel-context-leak-fire-and-forgetiamemilio/llama-stack:fix/otel-context-leak-fire-and-forgetCopy head branch name to clipboard