feat: expose inner marker_env #6854

Job	Run time
build binary \| macos aarch64	1m 7s
build binary \| windows	1m 30s
build binary \| macos x86_64	1m 44s
build binary \| linux	1m 31s
cargo clippy \| ubuntu	39s
cargo clippy \| windows	54s
cargo fmt	19s
cargo shear	23s
cargo test \| ubuntu	4m 18s
cargo test \| windows	5m 49s
check windows trampoline	2m 35s
cargo test \| macos	4m 53s
Determine changes	5s
benchmarks	1m 59s
check system \| homebrew python on macos aarch64	18s
check cache \| macos aarch64	12s
check system \| python on macos aarch64	15s
check system \| python3.13 on windows	1m 25s
check system \| python3.10 on windows	55s
check system \| python3.12 via chocolatey	1m 41s
check system \| embedded python3.10 on windows	32s
check system \| python3.10 on windows x86	51s
check cache \| ubuntu	53s
integration test \| conda on ubuntu	37s
ecosystem test \| prefecthq/prefect	2m 8s
check system \| python on debian	40s
ecosystem test \| pallets/flask	12s
check system \| python on ubuntu	14s
check system \| alpine	26s
check system \| amazonlinux	27s
check system \| conda3.8 on linux	41s
check system \| python on opensuse	34s
check system \| python on fedora	37s
check system \| conda3.11 on linux	39s
check system \| conda3.8 on windows	2m 11s
check system \| conda3.11 on windows	1m 49s
check system \| python via pyenv	2m 7s
check system \| pypy on ubuntu	30s
check system \| conda3.8 on macos	46s
check system \| pyston	4m 6s
check system \| conda3.11 on macos	44s
check system \| python on rocky linux 8	1m 37s
check system \| python on rocky linux 9	44s
check system \| python on macos x86_64	22s
	56m 59s

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