Amazon Q Developer @Prompt not working in VSCode IDE

## Problem
Amazon Q Developer @Prompt,Pin Context to attach file ,@workspace is not working in VSCode IDE, the dropdown menu when put @ in the chat prompt nothing comes.
## Steps to reproduce the issue

## Expected behavior
1. On Enter @ in chat window should open menu dropdown with the list of Prompts.

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS: WIN 11
- Visual Studio Code version:1.103.1
- AWS Toolkit version:3.72.0
- Amazon Q version:1.91.0

Start by reproducing the issue in the Amazon Q Chat window in VS Code with the reported Windows 11, VS Code 1.103.1, AWS Toolkit 3.72.0, and Amazon Q 1.91.0 versions. Check the @Prompt, @workspace, and Pin Context entry points and the Amazon Q logs. Done means typing @ and selecting Pin Context both show their expected dropdown menus.

Written by the indexing model from the issue text.