[cv][migration] log LUCI project in migration API handlers.
[cv][migration] log LUCI project in migration API handlers.

R=qyearsley, yiwzhang

Change-Id: Iadc7fe81c3cebb9126d21e60745c2577a1b21465
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2968291
Reviewed-by: Yiwei Zhang <50b2a565e2e78c292794832469a30ce5abc9959c@google.com>
Commit-Queue: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Auto-Submit: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>

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