cmd/golangorg: specify region in Cloud Build URLs explicitly

The GCP web UI remembers region selection across different visits.
If a user picks another region in another context, these links may
display a misleading page that doesn't show all intended build
history and trigger entries.

Explicitly include the region as global (non-regional) in the URL
to remove that pitfall and make the links more predictable.

Change-Id: Ie540853ef54bcfb253b28c492bbf56b251db28aa
Reviewed-on: https://go-review.googlesource.com/c/website/+/398536
Trust: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Jamal Carvalho <jamalcarvalho@google.com>

cmd/golangorg/README.md

@@ -43,4 +43,4 @@ Whether it passes or not, the new deployment can be found in the
 
 If the automatic deployment is not working, or to check on the status of a pending deployment,
 see the “website-redeploy-golang-org” trigger in the
-[Cloud Build console](https://console.cloud.google.com/cloud-build/builds?project=golang-org&query=trigger_id%3D%222399003e-0cc5-4877-86de-8bc8f13fd984%22).
+[Cloud Build console](https://console.cloud.google.com/cloud-build/builds;region=global?project=golang-org&query=trigger_id%3D%222399003e-0cc5-4877-86de-8bc8f13fd984%22).

cmd/golangorg/cloudbuild.yaml

@@ -1,5 +1,5 @@
 # This Cloud Build file is run automatically when commits land in the website repo.
-# See https://console.cloud.google.com/cloud-build/triggers?project=golang-org.
+# See https://console.cloud.google.com/cloud-build/triggers;region=global?project=golang-org.
 # Do not run directly.
 
 steps: