Remove `once_cell` dependency from most of the repo's crates. #1335

Job	Run time
Check fuzz targets	39s
Check rustdoc WASM target	31s
Run JS linters	1m 25s
Check lint and rustfmt	45s
Run tests	3m 8s
WASM tests	1m 4s
Python tests and maturin build (3.9)	1m 1s
pre-publish checks	0s
Python tests and maturin build (3.10)	1m 23s
Python tests and maturin build (3.11)	1m 2s
Python tests and maturin build (3.12)	1m 48s
All CI stages	1s
pre-publish checks	0s
publish trustfall_filetests_macros	0s
publish trustfall_core	0s
publish python trustfall	0s
publish trustfall_derive	0s
publish trustfall	0s
publish trustfall_stubgen	0s
	12m 47s

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