fix: Cancel the Timeout Task for HttpJson #5172

Job	Run time
build(8) except for gapic-generator-java	3m 30s
build (11)	12m 9s
build(21) except self-service clients	10m 40s
build (17)	11m 53s
build(8) for gapic-generator-java	9m 22s
compatibility	1m 33s
lint	19s
showcase (11)	3m 47s
gapic-generator-java-bom	1m 56s
showcase (17)	3m 47s
showcase-clirr	2m 58s
showcase-native	7m 23s
unmanaged_dependency_check	3m 36s
	1h 12m 53s

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