fix: added the env variable in backend to run it locally

[Dhruvkumar-Microsoft]

Purpose

This pull request makes a minor update to the .env.sample file by adding a new environment variable placeholder for Azure AI project endpoint configuration. This helps clarify required settings for Azure AI integration.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 4.2.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀