Rust

Move the Env testutil internal types into a single type (#1234) #3852

Job	Run time
fmt	8s
check-git-rev-deps	11s
docs	3m 10s
build-fuzz	1m 17s
cargo-deny (advisories)	4m 41s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	9m 32s
cargo-deny (bans licenses sources)	4m 43s
rust-analyzer-compat	2m 10s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	5m 38s
semver-checks	3m 52s
build-and-test (msrv, macos-latest, x86_64-apple-darwin)	24m 24s
build-and-test (msrv, macos-latest, aarch64-apple-darwin)	8m 39s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	13m 29s
readme	59s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 17s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 52s
build-and-test (latest, macos-latest, x86_64-apple-darwin)	23m 38s
build-and-test (latest, macos-latest, aarch64-apple-darwin)	8m 48s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	13m 10s
publish-dry-run (ubuntu-latest, wasm32-unknown-unknown) / publish-dry-run	2m 55s
publish-dry-run (ubuntu-latest, x86_64-unknown-linux-gnu, --feature-powerset --exclude-features d... / publish-dry-run	4m 32s
complete	1s
	2h 29m 6s

Provide feedback