Add `unknown-rule` (#15085) #37831

Job	Run time
cargo fmt	17s
Determine changes	12s
cargo build (release)	5m 12s
mkdocs	2m 36s
pre-commit	3m 14s
python package	1m 15s
cargo test (wasm)	1m 38s
cargo build (msrv)	4m 11s
cargo test (linux, release)	3m 38s
cargo test (windows)	3m 1s
cargo clippy	1m 53s
cargo fuzz build	5m 22s
cargo shear	27s
cargo test (linux)	2m 38s
test scripts	1m 2s
benchmarks	5m 39s
formatter instabilities and black similarity	3m 7s
test ruff-lsp	35s
fuzz parser	0s
ecosystem	0s
	45m 57s

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