[red-knot] Semantic index: handle invalid `break`s #36141

Job	Run time
cargo fmt	17s
Determine changes	10s
pre-commit	37s
mkdocs	2m 55s
python package	1m 23s
cargo clippy	1m 56s
cargo build (msrv)	3m 58s
benchmarks	5m 1s
cargo build (release)	0s
cargo fuzz build	0s
cargo shear	23s
cargo test (wasm)	1m 32s
cargo test (linux)	1m 44s
cargo test (windows)	5m 22s
formatter instabilities and black similarity	0s
test scripts	1m 1s
test ruff-lsp	34s
ecosystem	2m 41s
fuzz parser	0s
	29m 34s

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