Parse errors probably shouldn't trigger toast notifs during document formatting

[DavisVaughan]

It's fairly annoying to get toast notifs when you have a syntax error in the code. I think we should probably silently log in this particular case since we "refuse" to format in the presence of parse errors - it's not really an error case, it's an expected case with known behavior.

For example, ruff special cases syntax/parse errors as logged warnings, but not LSP Errors
https://github.com/astral-sh/ruff/blob/82c01aa6623b7d4df1e4f06cb2889059f287336f/crates/ruff_server/src/format.rs#L24-L28