[buildbucket] Handle 100% of GetBuild traffic
[buildbucket] Handle 100% of GetBuild traffic

Removes the traffic splitter for GetBuild.

Bug: 1042991
Change-Id: Iea7afdc5342628e4ef682a0f2095251889c4da6b
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2230216
Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: smut <95deb7aa15d4c615299e47e7688551456568b1fb@google.com>

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