fix: only write prefix file if needed #2986

Job	Run time
Cargo Format	20s
Cargo Lint	44s
Check intra-doc links	27s
Extract crate metadata	14s
Cargo Test \| Linux	11m 33s
Cargo Test \| macOS	12m 18s
Cargo Test \| macOS-arm	6m 23s
Cargo Test \| Windows	14m 38s
Build Binary \| Linux-x86_64	7m 52s
Build Binary \| Linux-aarch64	8m 54s
Build Binary \| macOS-x86	6m 52s
Build Binary \| macOS-arm	6m 52s
Build Binary \| Windows	21m 16s
Build Binary \| Windows-arm	15m 22s
downstream_tests (x86_64-apple-darwin, macOS-latest) / Integration test on macOS-latest	3m 10s
downstream_tests (x86_64-pc-windows-msvc, windows-latest, .exe) / Integration test on windows-latest	8m 7s
downstream_tests (x86_64-apple-darwin, macOS-latest) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (aarch64-apple-darwin, macOS-14) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (aarch64-apple-darwin, macOS-14) / Integration test on macOS-14	1m 3s
downstream_tests (x86_64-pc-windows-msvc, windows-latest, .exe) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (x86_64-unknown-linux-musl, ubuntu-20.04) / Downstream test ${{ matrix.repository }} on ${{ matrix.os }}	0s
downstream_tests (x86_64-unknown-linux-musl, ubuntu-20.04) / Integration test on ubuntu-20.04	54s
	2h 6m 59s

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