Improve detection of `TYPE_CHECKING` blocks imported from `typing_extensions` or `_typeshed` #21492

Job	Run time
cargo clippy	1m 47s
Determine changes	11s
cargo fmt	14s
cargo test (linux)	7m 7s
cargo test (wasm)	1m 55s
cargo fuzz	9m 30s
cargo test (windows)	5m 0s
cargo udeps	3m 12s
test scripts	1m 10s
mkdocs	1m 38s
pre-commit	32s
python package	1m 11s
benchmarks	9m 5s
formatter instabilities and black similarity	0s
test ruff-lsp	20s
ecosystem	7m 38s
	50m 30s

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