CodeWhisperer Suggestion Counter Stuck at One

## Problem

CodeWhisperer suggestion counter gets stuck at one, when I switch between different suggestions, I cannot see where I am, it always says 1/4.

## Steps to reproduce the issue

Type in VSCode, try to switch between suggestions by clicking the arrows.

## Expected behavior

That the counter moves according to the current suggestion.

## System details (run the `AWS: About Toolkit` command)

- OS: OSX
- Visual Studio Code version: 1.78.2 (Universal)
- AWS Toolkit version: Unknown.

Start by reproducing the issue in Visual Studio Code using CodeWhisperer suggestions and switching with the suggestion arrows. Trace the suggestion counter behavior and verify that the displayed position changes to match the currently selected suggestion.

Written by the indexing model from the issue text.