chore: write description to a file #5613

Job	Run time
build (11)	12m 22s
build(21) except self-service clients	11m 13s
build (17)	12m 33s
build(8) except for gapic-generator-java	4m 5s
build(8) for gapic-generator-java	9m 34s
compatibility	1m 39s
gapic-generator-java-bom	1m 52s
lint	18s
showcase (11)	4m 4s
showcase-clirr	3m 21s
showcase (17)	4m 3s
showcase-native	8m 7s
unmanaged_dependency_check	4m 0s
	1h 17m 11s

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