refactor: simplify schema migration helpers and remove unused class

[Adammatthiesen]

This pull request refactors and simplifies the schema migration helpers in the @withstudiocms/kysely package. The main improvement is replacing the MigrationSchemaManager class with a functional, Effect-based schemaManager factory, resulting in clearer, more composable code. The changes also include improved error handling and more idiomatic use of the Effect library.

Schema migration helper refactor:

• Replaced the MigrationSchemaManager class with a schemaManager function that returns composable methods for schema management, resulting in simpler and more functional code (migrator.ts).
• Updated the implementation of schema loading and saving to use Effect pipelines, with improved error handling and logging for database operations (migrator.ts).
• Updated usages in syncDatabaseSchema and rollbackMigration to use the new schemaManager instead of the previous class, ensuring consistency across the codebase (migrator.ts). [1] [2]

Minor cleanup:

• Removed an unused error type import from migrator.ts for clarity.

Changelog:

• Added a changeset describing the schema migration helper tweaks. (.changeset/eager-hairs-fix.md)

[changeset-bot]

🦋 Changeset detected

Latest commit: 6394d27

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@withstudiocms/kysely	Patch
@withstudiocms/sdk	Patch
@studiocms/devapps	Patch
@studiocms/migrator	Patch
studiocms	Patch
@studiocms/auth0	Patch
@studiocms/blog	Patch
@studiocms/cloudinary-image-service	Patch
@studiocms/discord	Patch
@studiocms/github	Patch
@studiocms/google	Patch
@studiocms/html	Patch
@studiocms/markdoc	Patch
@studiocms/md	Patch
@studiocms/mdx	Patch
@studiocms/s3-storage	Patch
@studiocms/wysiwyg	Patch

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch adam/fix-migrator

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commit: 6394d27

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