Refactor and clean up filter validity logic. (#620) #1574

Job	Run time
Check rustdoc WASM target	20s
Run tests	50s
Check lint and rustfmt	33s
Check fuzz targets	11s
Run JS linters	50s
pre-publish checks	5s
WASM tests	1m 22s
Python tests and maturin build (3.9)	52s
Python tests and maturin build (3.10)	42s
Python tests and maturin build (3.11)	32s
Python tests and maturin build (3.12)	45s
All CI stages	1s
pre-publish checks	1s
publish trustfall_filetests_macros / Did version change	8s
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 trustfall_derive / Did version change	4s
publish python trustfall / Did version change	8s
publish trustfall_derive / Semver	0s
publish trustfall_derive / Publish to crates.io	0s
publish trustfall / Did version change	4s
publish python trustfall / windows	0s
publish python trustfall / linux	0s
publish python trustfall / macos	0s
publish python trustfall / tag the version	0s
publish python trustfall / publish python trustfall	0s
publish trustfall / Semver	0s
publish trustfall / Publish to crates.io	0s
publish trustfall_stubgen / Did version change	8s
publish trustfall_stubgen / Semver	0s
publish trustfall_stubgen / Publish to crates.io	0s
	7m 40s

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