docs: Add instruction to install VS Code extension for WSL in development setup guide (#8313)

- This commit adds a step to the CVAT development setup guide for users working with WSL (Windows Subsystem for Linux). The added instruction guides users to install the VS Code extension for WSL, ensuring that Visual Studio Code opens correctly inside the WSL environment.

- This change addresses an issue where users might encounter a 'DEBUG STOPPED' error if the extension is not installed, improving the overall setup experience.

- Related to issue #8313.

Author: smit9924

site/content/en/docs/contributing/development-environment.md

@@ -234,7 +234,7 @@ You develop CVAT under WSL (Windows subsystem for Linux) following next steps.
   ```powershell
   wsl -d Ubuntu-18.04
   ```
-
+- Install the VS Code extension for WSL, which helps you to open VS Code correctly inside WSL. You can find the extension [here](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-wsl).
 - Run all commands from this installation guide in WSL Ubuntu shell.
 - You might have to manually start the redis server in wsl before you can start the configuration inside
   Visual Studio Code. You can do this with `sudo service redis-server start`. Alternatively you can also