Prepare azure.ai.agents 0.1.21-preview patch release#7625

trangevi merged 2 commits intomainAzure/azure-dev:mainfrom

copilot/prepare-new-patch-release-04972b9f-b58f-471a-afad-21ceac6c9284Azure/azure-dev:copilot/prepare-new-patch-release-04972b9f-b58f-471a-afad-21ceac6c9284Copy head branch name to clipboard