Revert "Revert "Ensure dex file are extracted and verified at load time""

The issue was caused by running device-gtests as root (which will always
have full write access everywhere).

For now, disable the tests that rely on file permissions when running as
root.

Test: m test-art-target-gtest-oat_file_assistant_test
Bug: 36605597
Bug: 36824842

This reverts commit 9bfc6bb1.

(cherry picked from commit 357c66dc)

Change-Id: I73820b8ff9d78af8d9bcb232c8345a07c5788539