Instead of storing recordIds and fetching the documents later, the migration process can instead use the repl::CollectionCloner to copy the contents of the collection when moving a big chunk with ignoreJumbo = true.

Steps:

1. Enter critical section. This will block new writes from being applied to the collection.
2. Skip MigrationChunkClonerSourceLegacy::startClone() on the donor shard.
3. Send _recvChunkStart to recipient shard with useCloner: true.
4. Recipient shard use repl::CollectionCloner to copy the collection
5. Donor shard sends _configsvrCommitChunkMigration
6. Donor cleans up chunk with RangeDeleter.