See the parent story for more context.
As the first part to this story we need a controller with the following workflow:

• Watches the `config.openshift.io/v1alpha1 Backup` CR as created by an admin
• Creates a CronJob for the specified schedule and timezone that would ultimately create `operator.openshift.io/v1alpha1 EtcdBackup` CRs at the desired schedule
• Updates the CronJob for any changes in the schedule or timezone

Since we also want to preserve a history of successful and failed backup attempts for the periodic config, the CronJob should utilize cronjob history limits to preserve successful and failed jobs.
https://kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/#jobs-history-limits

To begin with we can set this to a reasonable default of 5 successful and 10 failed jobs.