Remove useless TablesContext.tableNameAliasMap #12693

Job	Run time
Import Global Environment / init-environment	7s
Build E2E Image	8m 39s
E2E - Agent with MySQL (proxy, tracing, jaeger)	7m 45s
E2E - Agent with MySQL (proxy, tracing, zipkin)	7m 0s
E2E - Agent with MySQL (proxy, metrics, prometheus)	8m 8s
E2E - Agent with MySQL (proxy, logging, file)	7m 23s
E2E - Agent with MySQL (jdbc, logging, file)	6m 33s
E2E - Agent with MySQL (jdbc, metrics, prometheus)	6m 48s
E2E - Agent with MySQL (jdbc, tracing, jaeger)	7m 7s
E2E - Agent with MySQL (jdbc, tracing, zipkin)	6m 46s
	1h 6m 16s

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