Remove unnecessary string cloning from the parser #24722

Job	Run time
cargo fmt	15s
python package	1m 6s
Determine changes	10s
pre-commit	30s
mkdocs	2m 13s
cargo clippy	1m 50s
cargo test (windows)	4m 35s
cargo test (linux)	3m 43s
cargo test (wasm)	1m 9s
cargo fuzz	4m 13s
cargo udeps	1m 48s
formatter instabilities and black similarity	3m 48s
test scripts	46s
benchmarks	6m 10s
ecosystem	13m 19s
test ruff-lsp	31s
	46m 6s

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