ci: enable workspace lints across all Cargo.toml files #7

Job	Run time
runtime smoke	38s
parse conformance	51s
fmt + clippy	1m 14s
type + lowering conformance	56s
backend features (llvm-backend)	22s
backend features (default)	55s
SIMD contract (Cranelift)	41s
	5m 37s

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