[2.9] feat: add IsReleaseExists to check if a releaseName already exists or not and GetAppVersion to check the APP VERSION#490

williamshen9999 wants to merge 1 commit intorancher:release/v2.9rancher/shepherd:release/v2.9from

williamshen9999:release/v2.9williamshen9999/shepherd:release/v2.9Copy head branch name to clipboard