Amazon Q Developer becomes very slow when opening large projects.

## Problem

Amazon Q Developer becomes very slow when opening large projects.

## Steps to reproduce the issue
Run the code below to open this folder myproject in VSCode
```
mkdir myproject
cd myproject
git clone https://github.com/aws/aws-cli.git
git clone https://github.com/aws/serverless-application-model.git
git clone https://github.com/aws/aws-cdk.git
git clone https://github.com/aws/amazon-sagemaker-examples.git
git clone https://github.com/aws/s2n-tls.git
git clone https://github.com/aws/aws-sdk-go-v2.git
```

Sample Prompt
```
Hello. What can I do with Amazon Q Developer? Please give me a few examples.
```

The result, response is very slow.
You will get a reply in about 1 minute

reproduce-video:
https://github.com/user-attachments/assets/a8f87fd6-0c72-43fb-af1d-5573f63a24ed

## Expected behavior
Amazon Q Developer responds at normal speed.

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

- OS: Windows Server 2025 Datacenter(EC2 Instance t3.xlarge)
- Visual Studio Code version: 1.107.1
- AWS Toolkit version: 3.91.0
- Amazon Q version: vscode 1.107.1

Reproduce the slowdown in VS Code by opening the listed AWS repositories in one workspace on the stated Windows environment, then run the sample prompt and compare response time with a normal-sized project. Start with the Amazon Q and AWS Toolkit extension entry points available in VS Code; done means the same prompt responds at normal speed for the large workspace.

Written by the indexing model from the issue text.