Reapply "Change test_module_config from copying files to symlink ..." am: 01d31bdc

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3110324



Change-Id: I5bd85517df6119abc4a6e7631c341eba46ee21e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>