Decrease load (#35482)

Author: Amar3tto

.github/workflows/load-tests-pipeline-options/go_GBK_Flink_Batch_10b.txt

@@ -16,7 +16,7 @@
 
 --influx_namespace=flink
 --influx_measurement=go_batch_gbk_1
---input_options=''{\"num_records\":5000000,\"key_size\":1,\"value_size\":9}''
+--input_options=''{\"num_records\":500000,\"key_size\":1,\"value_size\":9}''
 --iterations=1
 --fanout=1
 --parallelism=5