Update string nodes for implicit concatenation #21976

Job	Run time
Determine changes	7s
cargo fmt	11s
cargo clippy	1m 50s
cargo test (linux)	3m 29s
cargo test (wasm)	1m 6s
cargo fuzz	3m 41s
test scripts	46s
cargo test (windows)	4m 19s
cargo udeps	1m 45s
mkdocs	2m 1s
pre-commit	30s
python package	1m 13s
benchmarks	9m 15s
formatter instabilities and black similarity	3m 32s
test ruff-lsp	16s
ecosystem	11m 13s
	45m 14s

Provide feedback