Fix `on conflict` error and add support for other `on conflict` queries in Postgres #13535

Job	Run time
Import Global Environment / init-environment	3s
Build E2E Image	5m 55s
E2E - Agent with MySQL (proxy, tracing, jaeger)	5m 57s
E2E - Agent with MySQL (proxy, tracing, zipkin)	5m 18s
E2E - Agent with MySQL (proxy, metrics, prometheus)	5m 57s
E2E - Agent with MySQL (proxy, logging, file)	5m 8s
E2E - Agent with MySQL (jdbc, logging, file)	5m 18s
E2E - Agent with MySQL (jdbc, metrics, prometheus)	5m 17s
E2E - Agent with MySQL (jdbc, tracing, jaeger)	5m 0s
E2E - Agent with MySQL (jdbc, tracing, zipkin)	5m 4s
	48m 57s

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