Remove the optional salsa dependency from the AST crate (#14363) #35714

Job	Run time
cargo fmt	20s
mkdocs	3m 14s
Determine changes	8s
pre-commit	46s
python package	1m 42s
cargo build (release)	6m 23s
cargo build (msrv)	4m 45s
benchmarks	5m 3s
cargo clippy	2m 17s
cargo fuzz	5m 13s
cargo shear	21s
cargo test (linux)	4m 57s
cargo test (wasm)	2m 6s
cargo test (windows)	10m 37s
formatter instabilities and black similarity	5m 0s
test scripts	1m 13s
test ruff-lsp	35s
ecosystem	0s
Fuzz the parser	6m 58s
	1h 1m 38s

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