Add Ballerina metrics logs observer #8739

Job	Run time
Build Ballerina Lang	7m 11s
Build Ballerina Distribution	18m 36s
Build Stdlib Level (1)	3m 40s
Build Stdlib Level (4)	15m 24s
Build Stdlib Level (2)	12m 12s
Build Stdlib Level (5)	18m 36s
Build Stdlib Level (3)	8m 39s
Build Stdlib Level (6)	18m 37s
Build Stdlib Level (7)	18m 37s
Build Stdlib Level (8)	18m 36s
Build Stdlib Level (9)	4m 16s
	2h 24m 24s

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