Preserve indent around multiline strings #23935

Job	Run time
cargo fmt	13s
python package	1m 8s
Determine changes	10s
pre-commit	32s
mkdocs	2m 11s
cargo test (windows)	4m 54s
cargo test (wasm)	1m 25s
cargo clippy	1m 44s
cargo test (linux)	3m 31s
cargo fuzz	5m 5s
cargo udeps	1m 49s
test scripts	56s
benchmarks	5m 56s
formatter instabilities and black similarity	3m 30s
ecosystem	5m 58s
test ruff-lsp	19s
	39m 21s

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