[red-knot] Understanding `type[Union[A, B]]` #37017

Job	Run time
cargo build (release)	0s
mkdocs	2m 31s
cargo fmt	17s
Determine changes	11s
pre-commit	36s
python package	1m 17s
cargo clippy	1m 51s
benchmarks	4m 54s
cargo fuzz build	0s
cargo build (msrv)	3m 50s
cargo shear	27s
cargo test (linux)	1m 52s
cargo test (linux, release)	3m 41s
cargo test (wasm)	1m 28s
cargo test (windows)	5m 4s
test scripts	1m 5s
formatter instabilities and black similarity	0s
ecosystem	2m 37s
fuzz parser	0s
test ruff-lsp	34s
	32m 15s

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