Change-Id: I82ddd918311b48e596adb807b81221973113fe7a
For example, when releasing from release-2.90, if `main` has a 2.91 tag ancestor, we know that 2.91 was released, so we should *not* tag latest. Change-Id: Ia56b17a2ee03bbec74b7c271c742858c690d450d