Extract remaining tests into separate file #559

Job	Run time
rust_ci (macos-latest, nightly)	2m 0s
rust_ci (macos-latest, stable)	44s
rust_ci (macos-latest, beta)	53s
rust_ci (ubuntu-latest, nightly)	1m 30s
rust_ci (windows-latest, nightly)	2m 50s
rust_ci (windows-latest, stable)	2m 38s
rust_ci (ubuntu-latest, stable)	59s
rust_ci (windows-latest, beta)	1m 44s
rust_ci (ubuntu-latest, beta)	56s
	14m 14s

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