Enable rename and delete actions for chat history items

[Copilot]

The rename action was only available for current chat sessions but not for history items in the Chat Sessions tree view, despite being available in the legacy "Show Chats" picker. This created an inconsistent user experience.

Changes Made

Enable Rename for History Items

• Removed the ChatContextKeys.isHistoryItem.isEqualTo(false) condition from the rename action's menu registration, allowing it to appear for both current and history chat sessions
• Added proper session ID handling in RenameChatSessionAction to strip the history- prefix before calling setChatSessionTitle(), consistent with how other actions handle history items
• Updated the comment to reflect that history items are now supported

Add Delete Action for History Items

• Implemented DeleteChatSessionAction with complete context handling following the same patterns as the rename action
• Added menu registration for the delete action, but only for history items (ChatContextKeys.isHistoryItem.isEqualTo(true)) to prevent accidental deletion of active sessions
• Uses the existing chatService.removeHistoryEntry() method with proper session ID processing

Before and After

Before: Users could only rename the current chat session. History items under the "History" node had limited context menu options.

After: Users can now rename both current and history chat sessions, and delete history items directly from the Chat Sessions tree context menu, providing a consistent experience with the legacy picker.

The implementation follows existing VS Code patterns and includes proper error handling and logging.

Fixes #264784.

Warning

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