message: Add to Jenkins CODEOWNERS
diff: /plugins/azure-devops @backstage/reviewers @marleypowell @awanlin
  /plugins/azure-devops-backend @backstage/reviewers @marleypowell @awanlin
  /plugins/azure-devops-common @backstage/reviewers @marleypowell @awanlin
  +/plugins/jenkins @backstage/reviewers @timja
  +/plugins/jenkins-backend @backstage/reviewers @timja
  /plugins/kafka @backstage/reviewers @nirga
  /plugins/kafka-backend @backstage/reviewers @nirga
  /plugins/scaffolder-backend-module-yeoman @backstage/reviewers @pawelmitka
  