[`pyflakes`] Visit forward annotations in `TypeAliasType` as types (`F401`) #39704

Job	Run time
cargo build (release)	0s
cargo fmt	18s
Determine changes	12s
mkdocs	2m 24s
pre-commit	3m 15s
python package	1m 20s
cargo build (msrv)	5m 5s
cargo clippy	2m 1s
cargo fuzz build	5m 45s
benchmarks	5m 13s
cargo shear	28s
cargo test (linux)	2m 13s
cargo test (linux, release)	4m 39s
cargo test (wasm)	1m 52s
cargo test (windows)	4m 40s
test scripts	1m 15s
formatter instabilities and black similarity	0s
ecosystem	2m 41s
test ruff-lsp	40s
fuzz parser	0s
	44m 1s

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