No longer consider "jenkins" votes when enqueuing
Our Gerrit no longer has any "jenkins" account verified votes on
open changes, so there is no reason to consider it in our pipeline
configuration. Remove the reference and simplify configuration.
current-patchset: True
approval:
- Verified: [1, 2]
- username: ^(zuul|jenkins)$
+ username: zuul
- Workflow: 1
trigger:
gerrit:
