refactor: support strict: true in @sanity/schema codebase

[stipsan]

Description

This change was done in #5983 and is required for #5983 to land. But as that PR is already quite large it's split up into its own PR to reduce the cognitive load for reviewers.
The objective is first and foremost to remove the requirement for these in the tsconfig for @sanity/schema:

{
  "noUnusedLocals": false,
  "strict": false
}

so that all our packages use the same compiler settings and can be used with compilerOptions.paths for IDE and language service features that can typecheck code between packages without first needing to save the file, or build the package.
Note that this compilerOptions.paths setup is implemented in #5983, this PR lays the groundwork for it.

What to review

Everything should continue to build, this is a TS concern and generated JS should be identical.

Testing

If the CI pass we're good, no manual testing needed.

Notes for release

N/A

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[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@types/inquirer@6.5.0	None	+1	73.4 kB	types
npm/@types/is-hotkey@0.1.10	None	0	5.68 kB	types
npm/@types/jsdom@20.0.1	None	+1	35.8 kB	types
npm/@types/lodash@4.17.0	None	0	862 kB	types
npm/@types/log-symbols@2.0.0	None	0	2.7 kB	types
npm/@types/minimist@1.2.5	None	0	6.27 kB	types
npm/@types/moment@2.13.0	None	0	508 B	types
npm/@types/node-ipc@9.2.3	None	0	20.6 kB	types
npm/@types/node@18.19.29	None	0	1.96 MB	types
npm/@types/object-inspect@1.13.0	None	0	6.05 kB	types
npm/@types/raf@3.4.3	None	0	2.85 kB	types
npm/@types/react-copy-to-clipboard@5.0.7	None	0	4.36 kB	types
npm/@types/react-dom@18.2.23	None	0	34.9 kB	types
npm/@types/react-is@18.2.4	None	0	5.67 kB	types
npm/@types/react@18.2.74	None	+1	438 kB	types
npm/@types/refractor@3.4.1	None	+1	47 kB	types
npm/@types/resolve-from@4.0.0	None	0	3.04 kB	types
npm/@types/rimraf@3.0.2	None	0	7.5 kB	types
npm/@types/semver-compare@1.0.3	None	0	2.97 kB	types
npm/@types/semver@6.2.7	None	0	13.5 kB	types
npm/@types/semver@7.5.8	None	0	23.3 kB	types
npm/@types/shallow-equals@1.0.3	None	0	2.86 kB	types
npm/@types/speakingurl@13.0.6	None	0	3.96 kB	types
npm/@types/tar-fs@2.0.4	None	0	5.96 kB	types
npm/@types/tar-stream@3.1.3	None	0	7.85 kB	types
npm/@types/tar@6.1.11	None	0	29.8 kB	types
npm/@types/three@0.150.2	None	+2	926 kB	types
npm/@types/use-sync-external-store@0.0.6	None	0	3.29 kB	types
npm/@types/validate-npm-package-name@3.0.3	None	0	5.2 kB	types
npm/@types/which@2.0.2	None	0	6.06 kB	types
npm/@types/ws@8.5.10	None	0	21.7 kB	types
npm/@types/yargs@17.0.32	None	+1	68.8 kB	types
npm/@typescript-eslint/eslint-plugin@7.5.0	None	+9	5.31 MB	jameshenry
npm/@typescript-eslint/parser@7.5.0	None	+4	1.37 MB	jameshenry
npm/@uiw/react-codemirror@4.21.25	None	+4	1.16 MB	wcjiang
npm/@vercel/frameworks@1.6.0	filesystem Transitive: eval	+1	312 kB	vercel-release-bot
npm/@vercel/fs-detectors@4.1.3	environment, filesystem, shell	+2	277 kB	vercel-release-bot
npm/@vercel/stega@0.1.0	None	0	25.4 kB	vercel-release-bot
npm/@vitejs/plugin-react@4.2.1	None	+3	64.1 kB	vitebot
npm/archiver@7.0.1	filesystem	+3	880 kB	ctalkington
npm/arrify@2.0.1	None	0	3.19 kB	sindresorhus
npm/async-mutex@0.4.1	None	0	54.7 kB	dirtyhairy
npm/boxen@4.2.0	None	+2	27.8 kB	sindresorhus
npm/cac@6.7.14	None	0	81.8 kB	egoist

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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Apr 4, 2024 8:17 AM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	31s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	24s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	12s	4	2	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	32s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 0s	14	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	59s	18	0	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	12s	6	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	13s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	19s	9	0	0