PM-2357 implemented split at tenant boundaries, PM-2353 implemented merge at tenant boundaries, and PM-2334 implemented change collections. This project is to update merge at tenant boundaries to copy the change collections from the donor to the recipient.

Things to consider for merge:

• Use file copy to copy the change collections
• Update recipient's oplog application to generate change collection entries at the donor timestamps. (Can continue to generate oplog entries for donor oplog entries in the recipient timeline for oplog application itself.)
• Might need to make change stream establishment check the access blocker, for the case the change stream is established against a recipient secondary.