Allow transparent cell magics #22454

Job	Run time
cargo fmt	13s
Determine changes	8s
mkdocs	2m 12s
pre-commit	24s
python package	1m 6s
cargo clippy	1m 42s
cargo fuzz	4m 13s
benchmarks	9m 58s
cargo test (linux)	3m 59s
cargo test (wasm)	1m 11s
cargo test (windows)	4m 31s
cargo udeps	1m 56s
formatter instabilities and black similarity	0s
test scripts	55s
ecosystem	7m 55s
test ruff-lsp	16s
	40m 39s

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