fix: Update setupEnv.sh file frontend to App

[NirajC-Microsoft]

Purpose

This pull request makes a small update to the frontend setup script to ensure the correct directory is used when installing dependencies. The change updates the path from ./src/frontend to ./src/App in .devcontainer/setupEnv.sh.

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