Merge "Add Singleton class to collect and validate test spec metadata." into main am: 29766f4d

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2824671



Change-Id: I6be5016e838c899b46de6931459487bca0acc651
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>