Sandbox CtsApkVerityTestDebugFiles

go/android-busy-beavers-sandboxing

It still has a diff in the generule_sandbox_test, but it's just the
addition of "./" in front of all the paths, which is fine.

Bug: 307824623
Test: ./build/soong/tests/genrule_sandbox_test.py CtsApkVerityTestDebugFiles
Change-Id: I8b352305cfb339bc5a09a2305e10a187723d754d