fix(restore): reset the kv.StreamId before sending to stream writer (#…

…7833) (#7837)

Reset the StreamId for the schema key to prevent ordering issues.

(cherry picked from commit 9557e56)

worker/restore_map.go

@@ -397,6 +397,8 @@ func (m *mapper) processReqCh(ctx context.Context) error {
 					return nil
 				}
 			}
+			// Reset the StreamId to prevent ordering issues while writing to stream writer.
+			kv.StreamId = 0
 			// Schema and type keys are not stored in an intermediate format so their
 			// value can be written as is.
 			kv.Key = restoreKey