Refactor askUserQuestion method to remove unused stream parameter

[DonJayamanne]

Remove the unused stream parameter from the askUserQuestion method across multiple files to streamline the code and improve clarity. This change enhances the method's signature and aligns it with its actual usage.

[Copilot]

Pull request overview

This PR refactors the askUserQuestion method signature to remove the unused stream parameter across the codebase. The refactoring simplifies the code by delegating stream management to VS Code's built-in tool invocation API (vscode.lm.invokeTool), which handles presentation through the toolInvocationToken parameter instead of requiring explicit stream passing.

Changes:

• Updated IUserQuestionHandler interface to remove the stream parameter from askUserQuestion method signature
• Refactored UserQuestionHandler implementation to use IToolsService.invokeTool directly instead of manually managing tool lifecycle with getCopilotTool and resolveInput
• Updated all call sites and test implementations to match the new signature

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/extension/agents/copilotcli/node/userInputHelpers.ts	Removed ChatResponseStream parameter from IUserQuestionHandler.askUserQuestion interface method signature
src/extension/chatSessions/vscode-node/askUserQuestionHandler.ts	Simplified implementation to use invokeTool API directly, removing manual tool retrieval, availability checks, and resolveInput calls
src/extension/agents/copilotcli/node/copilotcliSession.ts	Updated call site to pass parameters without the stream
src/extension/chatSessions/vscode-node/test/askUserQuestionHandler.spec.ts	Updated test helper to mock invokeTool instead of getCopilotTool, removed obsolete test cases for tool availability check and resolveInput behavior
src/extension/agents/copilotcli/node/test/copilotcliSession.spec.ts	Updated test stub to match new signature
src/extension/agents/copilotcli/node/test/copilotCliSessionService.spec.ts	Updated test stub to match new signature
src/extension/chatSessions/vscode-node/test/copilotCLIChatSessionParticipant.spec.ts	Updated test stub to match new signature