[red-knot] move standalone expression_ty to TypeInferenceBuilder::file_expression_ty #37063

Job	Run time
python package	1m 14s
pre-commit	37s
cargo fmt	20s
Determine changes	10s
mkdocs	2m 50s
cargo build (release)	0s
cargo test (linux, release)	3m 39s
cargo test (linux)	1m 44s
cargo clippy	1m 46s
cargo test (windows)	5m 4s
cargo build (msrv)	4m 1s
test scripts	59s
cargo fuzz build	0s
cargo test (wasm)	1m 27s
benchmarks	5m 1s
formatter instabilities and black similarity	0s
cargo shear	26s
test ruff-lsp	35s
ecosystem	2m 38s
fuzz parser	0s
	32m 31s

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