Add on-device signing end-to-end test.

This adds a host-driven test that verifies that installing an ART apex
with a newer version generates artifacts and ensures they are signed
with fs-verity. To that end, add a new ART test APEX which is identical
to the regular ART APEX, except it carries a different version number.

Bug: 165630556
Bug: 167516462
Test: atest odsign_e2e_tests
Change-Id: If12f3922bbaafd875cb3120d01540e0b73d012be
8 files changed