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Some files (like system logs) apply to a test run as a whole, and not
necessarily to a single test case. These artifacts can be uploaded to
RDB as "invocation-level" artifacts. So this crawls the system_logs
and crash dirs after a Tast test and uploads them as "invocation-level"
artifacts.

Bug: 1129654
Change-Id: I27f4cd27b4293a69364d37aa4be89a4185aa4900
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2541747Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828292}