Count older failures, in parallel, in CQ blamelist.
Count older failures, in parallel, in CQ blamelist.

BUG=chromium:334032
TEST=All unit tests.
TEST=--buildbot --debug paladin run.

Change-Id: I400c3a1e3faa7a9428746cae53b4f275f807152f
Reviewed-on: https://chromium-review.googlesource.com/184464
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite