cv: revert the hack to skip updating large cl stack
cv: revert the hack to skip updating large cl stack

This effectively reverts https://crrev.com/c/3414733

After switching chromeos to its dedicated project scoped account and
improving cl loading mechanism, LUCI CV should be able to handle the
ingestion of large CL stack now.

R=ddoman

Bug: 1290468
Change-Id: Ia64799055e93b4fc1acdd4ab7e49feee4a11fd73
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3550156
Auto-Submit: Yiwei Zhang <50b2a565e2e78c292794832469a30ce5abc9959c@google.com>
Reviewed-by: Scott Lee <1dcb292530f82960316cb3d87cd67c3f212b79cb@chromium.org>
Commit-Queue: Yiwei Zhang <50b2a565e2e78c292794832469a30ce5abc9959c@google.com>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go