feat: add Velero backups

Description

The cluster K8s resources are not backed up, meaning that in case of a disaster, it cannot be recovered easily or at all. This MR adds Velero backed backups for Grove clusters.

Supporting information

• https://velero.io/

Testing instructions

Steps to test the changes:

1. Create a ./control/velero symlink (done in <>)
2. Run ./control/velero get schedule
3. Validate that the three desired schedules are listed

Dependencies

N/A

Screenshots

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• All providers include the new feature/change
• All affected providers can provision new clusters
• Unit tests are added/updated
• Documentation is added/updated
• The TOOLS_CONTAINER_IMAGE_VERSION in ci_vars.yml is updated
• The grove-template repository is updated

Additional context

N/A