Add `on conflict` clause to query pipeline #5173

Job	Run time
Build Ballerina Lang	5m 21s
Build Stdlib Level (2)	14m 6s
Build Ballerina Distribution	51m 25s
Build Stdlib Level (1)	4m 52s
Build Stdlib Level (3)	6m 45s
Build Stdlib Level (4)	18m 32s
Build Stdlib Level (5)	33m 53s
Build Stdlib Level (6)	19m 5s
Build Stdlib Level (7)	17m 33s
Build Stdlib Level (8)	41m 0s
Build Stdlib Level (9)	5m 24s
	3h 37m 56s

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