Revert BigQueryIO bit of 'Make all uses of CountingOutputStream close…

… their resources'

This reverts the portion of commit 3115dbd
that touches BigQueryIO, which caused a double close bug.

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.java

@@ -2272,9 +2272,7 @@ public void write(TableRow value) throws Exception {
 
       public final KV<String, Long> close() throws IOException {
         channel.close();
-        KV<String, Long> record = KV.of(fileName, out.getCount());
-        out.close();
-        return record;
+        return KV.of(fileName, out.getCount());
       }
     }