Detect imports in `src` layouts by default #31895

Job	Run time
cargo fmt	16s
mkdocs	2m 35s
Determine changes	12s
pre-commit	34s
python package	1m 17s
cargo build (release)	7m 14s
cargo build (msrv)	3m 17s
cargo clippy	1m 51s
benchmarks	5m 16s
cargo fuzz	4m 56s
cargo shear	28s
cargo test (linux)	3m 41s
cargo test (wasm)	1m 25s
cargo test (windows)	8m 31s
test scripts	1m 4s
formatter instabilities and black similarity	0s
ecosystem	9m 2s
test ruff-lsp	14s
Fuzz the parser	0s
	51m 53s

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