Sync Schedule CRs into clusters

[nrb]

Describe the problem/challenge you have
Currently, Velero doesn't sync Schedule custom resources across clusters, only the Backup custom resources that were generated by that Schedule. This can be somewhat surprising to users, and is also lossy in the event of a total cluster loss - the original schedule has to be recreated from scratch.

Describe the solution you'd like
The Schedule objects should be synced into clusters via the BackupStorageLocation so that users can observe them with velero schedule get on clusters other than the ones where the Schedule was original defined.

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[ashish-amarnath]

We should also sync Restore CRs.
see #2697 for more details

[dsu-igeek]

This is useful but we definitely need to think through the use cases before implementing this. A common use case is to create a test cluster from a backup and this would cause it to start executing backups so we would need some controls.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Closing the stale issue.