Improve testing of STS credentials reloading#140114

DaveCTurner merged 6 commits intoelastic:mainelastic/elasticsearch:mainfrom

DaveCTurner:2026/01/02/s3-web-identity-token-reload-testsDaveCTurner/elasticsearch:2026/01/02/s3-web-identity-token-reload-testsCopy head branch name to clipboard