chore: migrate internal schemas package to npm-hosted package

[JoshMock]

I'm working on a standalone package for storing all Zod schemas. This removes the bundled package and depends on that package. Not ready to merge until @elastic/schemas is published to npm.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	0.98s
✅ REPOSITORY	gitleaks	yes		no	no	54.54s
✅ REPOSITORY	git_diff	yes		no	no	0.12s
✅ REPOSITORY	secretlint	yes		no	no	9.65s
✅ REPOSITORY	trivy	yes		no	no	15.2s
✅ YAML	yamllint	1		0	0	0.68s

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