[Backport 2.x] Adds default roles for Snapshot Management plugin (#1897)#1916

peternied merged 1 commit intoopensearch-project:2.xopensearch-project/security:2.xfrom

DarshitChanpura:backport-1902-to-2.xDarshitChanpura/security:backport-1902-to-2.xCopy head branch name to clipboard