Update CODEOWNERS for official/ (#7007)
Update CODEOWNERS for official/ (#7007)

Add rachellj218 to official/ owner
Add saberkun and hongjunCHoi to official/bert/ owner
tombstone/models,alexgorban/models,tombstone/models,alexgorban/models,alexgorban/models,tombstone/models,tombstone/models,alexgorban/models,tombstone/models,alexgorban/models,tombstone/models