cq_stats: do not take dry runs into account
cq_stats: do not take dry runs into account

BUG=492653

Review URL: https://codereview.chromium.org/1151833005

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra