This migrates the test configurations of all builders on the main
console (aka client.v8) to the V8 repository, preparing removal from
build/scripts/slave/recipe_modules/v8/builders.py.

NOTRY=true

Bug: chromium:830557
Change-Id: I40b8f31ab48426c7122c87e0221d6f05dc205e81
Reviewed-on: https://chromium-review.googlesource.com/c/1273237
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56547}