Refactor unary filters to deduplicate logic. (#696) #1732

Job	Run time
Run tests	45s
Check lint and rustfmt	26s
Check fuzz targets	26s
Check rustdoc WASM target	24s
Run JS linters	37s
pre-publish checks	8s
WASM tests	50s
Python tests and maturin build (3.9)	51s
Python tests and maturin build (3.10)	51s
Python tests and maturin build (3.11)	42s
Python tests and maturin build (3.12)	41s
Python tests and maturin build (3.13.0-rc - 3.13)	58s
All CI stages	1s
pre-publish checks	1s
publish trustfall_filetests_macros / Did version change	3s
publish trustfall_filetests_macros / Semver	0s
publish trustfall_filetests_macros / Publish to crates.io	0s
publish trustfall_core / Did version change	4s
publish trustfall_core / Semver	0s
publish trustfall_core / Publish to crates.io	0s
publish python trustfall / Did version change	3s
publish trustfall_derive / Did version change	4s
publish python trustfall / linux	0s
publish python trustfall / musllinux	0s
publish python trustfall / macos	0s
publish python trustfall / windows	0s
publish python trustfall / tag the version	0s
publish python trustfall / publish python trustfall	0s
publish trustfall_derive / Semver	0s
publish trustfall_derive / Publish to crates.io	0s
publish trustfall / Did version change	5s
publish trustfall / Semver	0s
publish trustfall / Publish to crates.io	0s
publish trustfall_stubgen / Did version change	6s
publish trustfall_stubgen / Semver	0s
publish trustfall_stubgen / Publish to crates.io	0s
	8m 6s

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