chore: suppress download progress #5376

Job	Run time
build(8) except for gapic-generator-java	3m 53s
build (11)	12m 7s
build(21) except self-service clients	10m 51s
build (17)	12m 4s
build(8) for gapic-generator-java	9m 33s
compatibility	1m 33s
lint	20s
gapic-generator-java-bom	1m 59s
showcase-clirr	3m 2s
showcase (11)	3m 58s
showcase-native	7m 29s
showcase (17)	3m 46s
unmanaged_dependency_check	4m 28s
	1h 15m 3s

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