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And refactor how we skip verifications of internal builders in
generate_buildbot_json.py

Bug: 1006414, 991417
Change-Id: I3520df707bfb19ba979c024d8f197e1b058c322a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825780Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699946}