[red-knot] Add symbols for `for` loop variables #32307

Job	Run time
cargo fmt	19s
pre-commit	45s
Determine changes	13s
mkdocs	2m 30s
python package	1m 10s
cargo build (msrv)	3m 24s
cargo build (release)	5m 16s
cargo clippy	1m 49s
benchmarks	4m 46s
cargo fuzz	5m 4s
cargo shear	25s
cargo test (linux)	3m 45s
cargo test (wasm)	1m 30s
cargo test (windows)	6m 37s
formatter instabilities and black similarity	0s
test scripts	57s
test ruff-lsp	20s
ecosystem	8m 54s
Fuzz the parser	0s
	47m 44s

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