[automerger skipped] Move env var config loading to be within the config...

[automerger skipped] Move env var config loading to be within the config package. am: 2f504db7 am: 4d5f00fe am: 14325e74 am: a16f1b04 -s ours

am skip reason: Merged-In Iab3957b64f4b5456a861057d16ad318f4f78e0cb with SHA-1 2f504db7 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/soong/+/18971604



Change-Id: I163b5685bd095dd34ba614e8e5d4af1f12e852fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>