fix: ReaperBatchSize should be a int type (#1150)

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## Which problem is this PR solving?

- the configMeta type for ReaperBatchSize was wrong

## Short description of the changes

-

config/metadata/configMeta.yaml

@@ -1978,7 +1978,7 @@ groups:
 
       - name: ReaperBatchSize
         firstVersion: v3.0
-        type: duration
+        type: int
         valuetype: nondefault
         default: 500
         reload: false