Saving test artifacts in TAPL when the failure is diagnosed

Not waiting for FailureWatcher to catch the exception and save
artifacts. This will help to save test artifacts before potential
deinitialization in the test which may change the screen contents.

Bug: 187761685
Test: presubmit
Flag: N/A
Change-Id: I7aa95028acfae3fe0895fc5df4ea6f6912fcda52