Remove manual destroys #487

Job	Run time
rust_ci (macos-latest, stable)	48s
rust_ci (macos-latest, beta)	52s
rust_ci (macos-latest, nightly)	1m 21s
rust_ci (ubuntu-latest, stable)	48s
rust_ci (ubuntu-latest, beta)	55s
rust_ci (ubuntu-latest, nightly)	1m 33s
rust_ci (windows-latest, stable)	1m 41s
rust_ci (windows-latest, beta)	1m 29s
rust_ci (windows-latest, nightly)	2m 48s
	12m 15s

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