red-knot: Use `parse_unchecked` to get all parse errors #29102

Job	Run time
cargo fmt	19s
mkdocs	2m 41s
Determine changes	9s
pre-commit	35s
python package	1m 29s
cargo fuzz	4m 25s
benchmarks	4m 59s
cargo build (release)	5m 35s
cargo clippy	1m 56s
cargo shear	21s
cargo test (linux)	3m 29s
cargo test (wasm)	1m 22s
cargo test (windows)	7m 42s
formatter instabilities and black similarity	4m 21s
test scripts	1m 0s
ecosystem	15m 26s
test ruff-lsp	20s
Fuzz the parser	5m 29s
	1h 1m 38s

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