rune: Vm cleanup #1846

Job	Run time
clippy	2m 10s
docs	3m 19s
msrv	1m 33s
nightly	3m 38s
rustfmt	14s
basics	1s
no_std (ubuntu-latest, minimal)	1m 10s
test_miri (rune)	3m 48s
no_std (macos-latest, minimal)	1m 38s
test_miri (rune-core)	50s
test_doc	9m 29s
test_miri (rune-alloc)	5m 58s
build_feature (alloc)	3m 9s
build_feature (cli)	4m 12s
test_lib	4m 17s
build_feature (cli,doc)	5m 0s
test_rune	3m 5s
build_feature (cli,fmt)	4m 7s
wasm	1m 10s
build_feature (doc)	3m 41s
build_feature (workspace)	3m 25s
build_feature (languageserver)	3m 49s
build_feature (byte-code)	3m 29s
build_feature (capture-io)	3m 36s
build_feature (emit)	3m 23s
	1h 20m 11s

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