Add Ballerina metrics logs observer #8796

Job	Run time
Build Ballerina Lang	7m 9s
Build Ballerina Lang	7m 9s
Build Ballerina Distribution	1h 5m 12s
Build Ballerina Distribution	1h 5m 51s
Build Stdlib Level (1)	3m 49s
Build Stdlib Level (1)	3m 49s
Build Stdlib Level (2)	3m 12s
Build Stdlib Level (2)	3m 37s
Build Stdlib Level (3)	8m 19s
Build Stdlib Level (3)	8m 26s
Build Stdlib Level (4)	15m 34s
Build Stdlib Level (4)	15m 34s
Build Stdlib Level (7)	15m 32s
Build Stdlib Level (7)	14m 40s
Build Stdlib Level (5)	30m 27s
Build Stdlib Level (5)	41m 19s
Build Stdlib Level (6)	25m 39s
Build Stdlib Level (6)	25m 39s
Build Stdlib Level (8)	42m 53s
Build Stdlib Level (8)	42m 53s
Build Stdlib Level (9)	4m 19s
Build Stdlib Level (9)	4m 19s
	7h 35m 21s

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