Remove `@` in `pytest.mark.parametrize` rule messages #36781

Job	Run time
cargo fmt	20s
cargo build (release)	0s
Determine changes	16s
mkdocs	2m 42s
pre-commit	39s
python package	1m 30s
benchmarks	4m 56s
cargo clippy	1m 50s
cargo build (msrv)	4m 6s
cargo fuzz build	0s
cargo shear	28s
cargo test (linux)	1m 47s
cargo test (linux, release)	3m 54s
cargo test (wasm)	1m 42s
cargo test (windows)	5m 37s
test scripts	1m 4s
formatter instabilities and black similarity	0s
test ruff-lsp	53s
ecosystem	2m 50s
fuzz parser	0s
	34m 34s

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