Closes https://linear.app/zed-industries/issue/Z-2537/inlay-hint-issues

Language servers such as typescript-language-servers report a single
work event, ending right after server's startup.

Other servers might send more similar event, also during startup. The
rest of the events are diagnostic-related and we filter them out.

React on such events with /refresh-like hint update, that will check
only the visible part of the editor for hints and might be replaced by
other /refresh requests, if needed.

Release Notes:

- N/A