fix: use the right channel to feed the data in (#18605)

this PR fixes a regression in batch replication
where we weren't sending any data from the Walk()
results due to incorrect channels being used.

.golangci.yml

@@ -29,5 +29,8 @@ linters:
 issues:
   exclude-use-default: false
   exclude:
+    - "empty-block:"
+    - "unused-parameter:"
+    - "dot-imports:"
     - should have a package comment
     - error strings should not be capitalized or end with punctuation or a newline