Currently with data mover, we do not have any option to set the prune interval on volsync replication osurce

Verification steps for 1.2.1

1. Set pruneInterval value as small as possible.
2. Set SnapshotRetainPolicy to remove the snapshot. 
3. Verify that the snapshotcontent is removed from s3 bucket. 

You will need to update the documentation to include