fix: prevent "Current ask promise was ignored" error when cancelling tasks

[roomote]

This PR fixes issue #5955 where task history gets unexpectedly truncated after cancelling a running task.

Problem

When a task was cancelled while an ask promise was waiting for user response, the promise state was not properly cleared. This caused the "Current ask promise was ignored" error when trying to resume the task from history.

Solution

1. Clear ask promise state (askResponse, askResponseText, askResponseImages) in abortTask() method
2. Add abort check in ask() method to handle task cancellation gracefully while waiting for response
3. Clear ask promise state at the beginning of resumeTaskFromHistory() to ensure clean state

Testing

• Ran existing tests for ClineProvider which all pass
• ESLint checks pass
• TypeScript type checks pass

Fixes #5955

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Important

Fixes issue #5955 by clearing ask promise state in abortTask() and resumeTaskFromHistory() methods in Task.ts to prevent errors when cancelling tasks.

• Behavior:
  • Fixes issue Task history gets unexpectedly truncated #5955 by clearing ask promise state (askResponse, askResponseText, askResponseImages) in abortTask() and resumeTaskFromHistory() methods in Task.ts.
  • Adds abort check in ask() method to handle task cancellation while waiting for response.
• Testing:
  • Existing tests for ClineProvider pass.
  • ESLint and TypeScript checks pass.

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[daniel-lxs]

Should be handled by #5544