chore(Jenkinsfile) avoid rebuilding tags and PRs daily

[dduportal]

Fixup of https://github.com/jenkins-infra/plugin-health-scoring/pull/536 which introduces a daily cron trigger.

We forgot that this trigger should be "branch-conditionnal" otherwise it tries to rebuild everything including tags once a day (which is... not a good thing)

---

Notes:

• No need to trigger a release: this change will be picked by the jobs once merged
• Regarding the tags, I'll run a build replay to set them up to "never rebuild" with a successful status (dummy echo OK step) so it will stop them. Only the following tags are subject to the rebuild:
  • 4.0.0
  • 4.0.1
  • 4.0.2
  • 4.1.0

[dduportal]

Good, thanks!

the tags mentioned in the body had been replayed with the following pipeline:

pipeline {
    agent none
    triggers {
        cron('')
    }
    stages {
        stage('Hello') {
            steps {
                echo 'OK'
            }
        }
    }
}

and now shows no more daily cron trigger!