Lunny Xiao
85f31eb643
Fix #29763 Backport #29783 This PR fixes 2 problems with CodeOwner in the pull request. - Don't use the pull request base branch but merge-base as a diff base to detect the code owner. - CodeOwner detection in fork repositories will be disabled because almost all the fork repositories will not change CODEOWNERS files but it should not be used on fork repositories' pull requests. --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>