Fix scoping for generators in named expressions in classes #22894

Job	Run time
Determine changes	14s
cargo fmt	15s
pre-commit	47s
python package	1m 14s
mkdocs	2m 9s
cargo clippy	1m 50s
cargo test (wasm)	1m 16s
cargo test (windows)	5m 27s
cargo test (linux)	3m 44s
cargo fuzz	4m 23s
cargo udeps	1m 54s
test scripts	51s
benchmarks	5m 53s
formatter instabilities and black similarity	0s
ecosystem	7m 50s
test ruff-lsp	16s
	38m 3s

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