ruff server: Formatting a document with syntax problems no longer spams a visible error popup

[snowsignal]

Summary

Fixes astral-sh/ruff-vscode#482.

I've made adjustments to format and format_range that handle parsing errors before they become server errors. We'll still log this as a problem, but there will no longer be a visible popup.

Test Plan

Instead of seeing a visible error when formatting a document with syntax issues, you should see this warning in the LSP logs:

Similarly, if you try to format a range with syntax issues, you should see this warning in the LSP logs instead of a visible error popup:

[codspeed-hq]

CodSpeed Performance Report

Merging #11745 will not alter performance

_{Comparing jane/server/error-spam (9293364) with main (d056d09)}

Summary

✅ 30 untouched benchmarks

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.