[Refactor] Clean up dead code and improve type safety in TomlFile

[gonzaloriestra]

WHY are these changes introduced?

This pull request performs a minor clean-up of the TOML file utility by eliminating unused dead code and improving type safety.

WHAT is this pull request doing?

• Removed the unused readonly errors: TomlFileError[] = [] property from the TomlFile class.
• Improved type safety in the decode method of TomlFile by catching err as unknown and safely checking for properties line and col via a structured cast (err as {line?: number; col?: number; message?: string}), thereby eliminating an eslint-disable-next-line directive for @typescript-eslint/no-explicit-any.

How to test your changes?

CI

Post-release steps

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 16788915692167444211 started by @gonzaloriestra

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