fix(google_ai): close aiohttp session to prevent ResourceWarning#2629

raymondWai wants to merge 3 commits intodeepset-ai:maindeepset-ai/haystack-core-integrations:mainfrom

raymondWai:fix-unclosed-session-google-airaymondWai/haystack-core-integrations:fix-unclosed-session-google-aiCopy head branch name to clipboard