[cv] update queue.yaml with a specific target
[cv] update queue.yaml with a specific target

CV is already running with multiple binaries, and there will be more.
It's better to specify the target to avoid accidentally misrouted
messages.

Bug: 1358208
Change-Id: I55ff80b63c3ce56925b1c5401f8768d23c56f83b
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3905662
Auto-Submit: Scott Lee <1dcb292530f82960316cb3d87cd67c3f212b79cb@chromium.org>
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