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

Merge "Give an error when trying to build "next" targets" into main am: 23a778b3 am: 773e7461 am: a1c5a31b

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



Change-Id: Iffa0f057ae3218aa66829d453669604ee8b6b23b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>