switch to existing artifact bucket #818

Job	Run time
Build	48s
Verify Generated Templates	2m 31s
Checkstyle	1m 56s
Spotless	2m 12s
Unit Tests	1m 52s
Dataflow Templates Integration Smoke Tests	1m 7s
Dataflow Templates Integration Tests	41m 32s
Dataflow Templates Load Tests	-1s
	51m 57s

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