[Feature] Propagate DeltaSnapshotRetentionPeriod Flag to etcd-backup-restore

[seshachalam-yv]

Feature (What you would like to be added):
Modify etcd-druid to propagate the --delta-snapshot-retention-period flag from the Etcd CRD to the etcd-backup-restore component.

Motivation (Why is this needed?):
The etcd-backup-restore component has recently introduced a --delta-snapshot-retention-period flag (PR #640). This flag allows users to customize the retention period for delta snapshots, providing more flexibility for both Exponential and Limit-Based GC policies. To leverage this feature in etcd-druid, we need to modify etcd-druid to propagate this flag to the etcd-backup-restore component.

Approach/Hint to the implement solution (optional):

[seshachalam-yv]

/assign

[shreyas-s-rao]

This has been completed as part of #651
/close