COD-1345: Do not gzip walltime reports #697

Job	Run time
plan	30s
build-local-artifacts (aarch64-unknown-linux-musl)	2m 13s
build-local-artifacts (x86_64-unknown-linux-musl)	1m 33s
build-global-artifacts	26s
host	0s
announce	0s
custom-bump-action	0s
	4m 42s

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