[repository-s3] remove endpointOverride and let AWS SDK V2 S3 determine the s3 url based on bucket name or arn provided#20345

cwperks wants to merge 3 commits intoopensearch-project:mainopensearch-project/OpenSearch:mainfrom

cwperks:repository-s3-outpostscwperks/OpenSearch:repository-s3-outpostsCopy head branch name to clipboard