Simplify path length check in `download_and_unpack_nested_gzip_archive` #1246

Job	Run time
lint	14s
unit-test	13s
integration-test (builder:24, arm64)	3m 43s
integration-test (builder:24, amd64)	3m 19s
integration-test (builder:22, amd64)	1m 12s
	8m 41s

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