dev/dn: create trace for PR to deploy
Created by: bobheadxi
When notifying for a deployment event, also create a build trace that ties all associated PRs' merge times per-service to the deployment event, to measure how long each service goes from change to a deployed environment.
Closes https://github.com/sourcegraph/sourcegraph/issues/31851 part of https://github.com/sourcegraph/sourcegraph/issues/32153
Test plan
go install ./enterprise/dev/deployment-notifier
Then head over to deploy-sourcegraph-cloud
:
deployment-notifier -environment preprod -honeycomb.token=$HONEYCOMB_TOKEN -github.token=$GITHUB_TOKEN
https://github.com/sourcegraph/sourcegraph/pull/33120#issuecomment-1080969897