fix: Cancel the Timeout Task for HttpJson #5284

Job	Run time
build(21) except self-service clients	10m 41s
build (11)	12m 5s
build (17)	11m 33s
build(8) except for gapic-generator-java	3m 28s
build(8) for gapic-generator-java	9m 30s
compatibility	1m 33s
lint	24s
showcase (11)	3m 34s
showcase-clirr	3m 17s
showcase (17)	3m 59s
showcase-native	7m 18s
gapic-generator-java-bom	1m 41s
unmanaged_dependency_check	3m 26s
	1h 12m 29s

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