[red-knot] Markdown test runner #39242

Job	Run time
Determine changes	13s
cargo fmt	20s
cargo build (release)	0s
mkdocs	2m 45s
pre-commit	3m 18s
python package	1m 28s
cargo build (msrv)	4m 13s
cargo clippy	1m 52s
benchmarks	5m 4s
cargo fuzz build	5m 8s
cargo test (linux)	1m 46s
cargo shear	25s
cargo test (linux, release)	4m 0s
cargo test (wasm)	1m 39s
cargo test (windows)	7m 7s
formatter instabilities and black similarity	0s
test scripts	1m 3s
ecosystem	2m 42s
test ruff-lsp	41s
fuzz parser	0s
	43m 44s

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