CHROMIUM: scheduler: dump build log too for long running builds

Our old parallel_emerge wrapper would dump build logs for packages
that were taking too long to help debug.  Implement similar logic
here in our new long task tracker.

BUG=chromium:1095661
TEST=CQ passes
TEST=looked at output behavior with manual lower timeouts

Change-Id: I8488708da80315afa711b9c18382f95b74f7a423
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/2347447
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
2 files changed