[red-knot] Rename constraint to predicate #41183

Job	Run time
cargo fmt	18s
cargo build (release)	0s
mkdocs	2m 28s
Determine changes	11s
pre-commit	3m 20s
python package	1m 19s
cargo clippy	1m 55s
cargo test (linux)	2m 15s
cargo test (linux, release)	3m 58s
cargo test (windows)	3m 50s
cargo fuzz build	4m 3s
cargo test (wasm)	1m 33s
cargo build (msrv)	2m 17s
cargo shear	26s
test scripts	1m 12s
benchmarks	4m 24s
formatter instabilities and black similarity	0s
test ruff-lsp	0s
fuzz parser	0s
ecosystem	0s
	33m 29s

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