[BUG]: Remove yarn.lock file

[karkir0003]

Operating system

N/A

Bug description

Context
DLP transitioned from yarn to pnpm as the package manager for frontend dependencies. However, in the frontend/ directory of the project, the yarn.lock file still persists. We don't require this file as a pnpm-lock.yaml file is generated from pnpm.

Solution:

1. Remove the yarn.lock file from frontend/ directory/folder.
2. Create a pull request and tag @project Lead in discord (with link to the pull request)

Steps to reproduce

Examine the frontend/ directory and check that the yarn.lock file is there

[github-actions]

Hello @karkir0003! Thank you for submitting the 🐞Bug Request Form. We appreciate your contribution. 👋

We will look into it and provide a response as soon as possible.

To work on this bug request, you can follow these branch setup instructions:

1. Checkout the main branch:

```
 git checkout nextjs
```

2. Pull the latest changes from the remote main branch:

```
 git pull origin nextjs
```

3. Create a new branch specific to this bug request using the issue number:
   git checkout -b bug-1117

Feel free to make the necessary changes in this branch and submit a pull request when you're ready.

Best regards,
Deep Learning Playground (DLP) Team

[karkir0003]

Steps on how to test your changes:

1. After removing the yarn.lock file from frontend/, please run dlp-cli frontend start and verify that localhost:3000 renders the app. You will also need to run dlp-cli backend start in a separate terminal window to load up the backend

[farisdurrani]

Completed in a previous PR