cloud: add cloud release notes for release-20261027 - #24556

cloud: add cloud release notes for release-20261027#24556

ti-chi-bot[bot] merged 7 commits into

release-8.5pingcap/docs:release-8.5from

cloud/add-release-note-20261027pingcap/docs:cloud/add-release-note-20261027Copy head branch name to clipboard