Add Ballerina metrics logs observer #8744

Job	Run time
Build Ballerina Lang	7m 24s
Build Ballerina Lang	7m 24s
Build Ballerina Distribution	1h 6m 31s
Build Ballerina Distribution	1h 7m 50s
Build Stdlib Level (1)	3m 36s
Build Stdlib Level (1)	3m 36s
Build Stdlib Level (2)	13m 6s
Build Stdlib Level (2)	13m 6s
Build Stdlib Level (3)	9m 7s
Build Stdlib Level (3)	9m 7s
Build Stdlib Level (4)	16m 20s
Build Stdlib Level (4)	16m 20s
Build Stdlib Level (5)	42m 0s
Build Stdlib Level (5)	42m 0s
Build Stdlib Level (6)	26m 8s
Build Stdlib Level (6)	26m 8s
Build Stdlib Level (7)	36m 6s
Build Stdlib Level (7)	36m 6s
Build Stdlib Level (8)	31m 23s
Build Stdlib Level (8)	31m 23s
Build Stdlib Level (9)	5m 39s
Build Stdlib Level (9)	5m 39s
	8h 35m 59s

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