Restore the test state before every test in OdrefreshHostTest.

To save time, we don't run odrefresh before every test to reset the test
state. Therefore, the test state can leak from one test to another. This
used to be fine because it used to be the case that all the tests ended
in a clean state, where the artifacts all exist and are up-to-date.
However, this is no longer true since aosp/2366494, which introduced a
test that ends in the state where the artifacts are in "verify" rather
than the normal "speed-profile" filter, causing any test the runs after
it to fail.

It's possible to fix that test, but the pitfall that every test has to
end in a clean state will remain. Instead of doing this, this change
added code to backup the artifacts and restore them before every test to
make sure every test starts in a clean state.

Bug: 269223220
Test: atest odsign_e2e_tests_full:OdrefreshHostTest
Change-Id: I7ccd6ae56c7c802d9278fad89e196d640bae8c90

0 files changed, 0 insertions, 0 deletions