[cq][datastore] enable safe Get.
[cq][datastore] enable safe Get.

R=ddoman

Bug: 1242998
Change-Id: I37345e5e4c694de72f41557caaf25b28f4982830
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3118628
Auto-Submit: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Commit-Queue: Yiwei Zhang <50b2a565e2e78c292794832469a30ce5abc9959c@google.com>
Reviewed-by: Yiwei Zhang <50b2a565e2e78c292794832469a30ce5abc9959c@google.com>

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