[cv][migration] log entire request of unexpectedly finished Run.
[cv][migration] log entire request of unexpectedly finished Run.

This happened 20+ times in the last day and it's easier to
investigate if all details are given immediately.

R=qyearsley, yiwzhang

Bug: 1221178
Change-Id: I007d14a4c94228b0cbfb458a3188ba093c044b42
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2968292
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