Add test prefix to test files for less confusion #544

Job	Run time
rust_ci (macos-latest, beta)	15s
rust_ci (ubuntu-latest, beta)	21s
rust_ci (macos-latest, nightly)	22s
rust_ci (ubuntu-latest, nightly)	19s
rust_ci (ubuntu-latest, stable)	13s
rust_ci (macos-latest, stable)	14s
rust_ci (windows-latest, stable)	13s
rust_ci (windows-latest, nightly)	11s
rust_ci (windows-latest, beta)	12s
	2m 20s

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