Fix: preventing leading slash in S3/MinIO keys when prefix is empty#1902

AadarshBhalerao wants to merge 1 commit intostrands-agents:mainstrands-agents/sdk-python:mainfrom

AadarshBhalerao:fix/s3-session-empty-prefixAadarshBhalerao/sdk-python:fix/s3-session-empty-prefixCopy head branch name to clipboard