avoid writing and reparsing the artifact usage file once per artifact… #4266

Job	Run time
docs	4m 5s
test (ubuntu-latest, x64, pkg.julialang.org, nightly)	19m 16s
test (ubuntu-latest, x86, pkg.julialang.org, nightly)	21m 47s
test (macOS-14, aarch64, pkg.julialang.org, nightly)	16m 4s
test (windows-latest, x64, pkg.julialang.org, nightly)	31m 57s
test (windows-latest, x86, pkg.julialang.org, nightly)	37m 54s
test (ubuntu-latest, x64, nightly)	19m 43s
	2h 30m 46s

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