More envsetup.sh cleanup -- move these to standalone scripts am: ded5d2de am: b5a20668

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3101801



Change-Id: I975776f5892c777120e1148f91e8f23aa91c9a49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>