[red-knot] ruff_db: make diagnostic rendering prettier #39775

Job	Run time
mkdocs	2m 40s
Determine changes	10s
cargo fmt	18s
cargo build (release)	0s
pre-commit	3m 22s
python package	1m 18s
cargo build (msrv)	5m 2s
cargo fuzz build	4m 27s
cargo clippy	1m 46s
benchmarks	5m 5s
cargo shear	23s
cargo test (linux, release)	4m 1s
cargo test (wasm)	1m 39s
cargo test (linux)	2m 5s
cargo test (windows)	4m 16s
formatter instabilities and black similarity	3m 17s
test scripts	1m 1s
fuzz parser	5m 38s
test ruff-lsp	34s
ecosystem	4m 3s
	51m 5s

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