Don't skip over imports and other nodes containing nested statements in import collector #33382

Job	Run time
pre-commit	39s
Determine changes	8s
cargo fmt	19s
python package	1m 16s
mkdocs	2m 59s
benchmarks	4m 58s
cargo build (release)	5m 26s
cargo clippy	1m 52s
cargo build (msrv)	3m 15s
cargo fuzz	5m 41s
cargo shear	21s
cargo test (linux)	3m 54s
cargo test (wasm)	1m 32s
cargo test (windows)	7m 20s
test scripts	1m 2s
formatter instabilities and black similarity	0s
ecosystem	8m 56s
test ruff-lsp	14s
Fuzz the parser	0s
	49m 52s

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