Fix import suggestions

[benibenj]

Copilot Generated Description: Update import statements and enhance the DiagnosticsNextEditProvider class to improve handling of diagnostic edits, including better cancellation logic and state management. Add a toString method for DiagnosticCompletionItem.

[Copilot]

Pull request overview

This PR refactors the diagnostics-based inline edit provider to improve state management and cancellation handling. The changes replace a polling-based approach with an event-driven model using workInProgress tracking and the raceCancellation utility.

Key Changes:

• Introduced workInProgress field to track async operation state across the diagnostics completion system
• Refactored runUntilNextEdit to use event-driven waiting instead of polling via getNextUpdatedState
• Enhanced timeout logic for diagnostics provider to calculate remaining time dynamically

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
inlineCompletionProvider.ts	Added clamp import and improved diagnostics timeout calculation to respect remaining request time
diagnosticsInlineEditProvider.ts	Added workInProgress tracking, refactored runUntilNextEdit to use raceCancellation with event listeners, made getNextEdit throw error
diagnosticsCompletionProcessor.ts	Added workInProgress field to state, simplified _getDiagnostics return type, removed getNextUpdatedState method, refactored AsyncWorker to track work-in-progress state
diagnosticsCompletions.ts	Added toString method to DiagnosticCompletionItem for better debugging