Merge "Give an error when trying to build "next" targets" into main am: 23a778b3

Original change: https://android-review.googlesource.com/c/platform/build/+/2703313



Change-Id: Ib224b23c64038453e52456696c4e900453a00b9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>