Fail formatting if there are syntax error nodes

[xunilrj]

Description

This PR complements #4912.

We currently do not allow file with syntax errors to be formatted, but if the fmt was called with AST with syntax errors, it would "eat" all error spans.

Now the whole formatting will fail with a more decent error message.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.