Enable notebooks by default in preview mode #31272

Job	Run time
cargo fmt	16s
pre-commit	33s
Determine changes	8s
mkdocs	2m 46s
python package	1m 29s
cargo build (release)	4m 11s
cargo build (msrv)	3m 11s
cargo clippy	2m 1s
cargo fuzz	5m 7s
cargo test (linux)	3m 26s
cargo test (wasm)	1m 16s
cargo test (windows)	6m 21s
test scripts	1m 15s
cargo shear	38s
formatter instabilities and black similarity	0s
benchmarks	4m 37s
test ruff-lsp	21s
ecosystem	8m 59s
Fuzz the parser	0s
	46m 35s

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