[master] Fix XML parser truncating large texts #5179

Job	Run time
Build Ballerina Lang	2m 58s
Build Ballerina Distribution	21m 35s
Build Stdlib Level (1)	5m 37s
Build Stdlib Level (3)	5m 55s
Build Stdlib Level (2)	11m 8s
Build Stdlib Level (4)	15m 6s
Build Stdlib Level (5)	21m 35s
Build Stdlib Level (6)	21m 35s
Build Stdlib Level (8)	21m 56s
Build Stdlib Level (7)	21m 23s
Build Stdlib Level (9)	5m 18s
	2h 34m 6s

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