Speed up ATX cache warmup (#6241) #20259

Job	Run time
filter-changes	4s
unittests (ubuntu-22.04)	8m 20s
build (ubuntu-22.04)	1m 4s
unittests (ubuntu-latest-arm-8-cores)	12m 19s
quicktests	1m 48s
build (ubuntu-latest-arm-8-cores)	5m 0s
unittests (self-hosted, macOS, ARM64, go-spacemesh)	4m 49s
build (macos-13)	1m 51s
unittests (windows-2022)	13m 21s
build (self-hosted, macOS, ARM64, go-spacemesh)	25s
lint	2m 20s
build (windows-2022)	7m 20s
ci-status	7s
	58m 48s

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