fix: Dockerfile issue

[Harmanpreet-Microsoft]

Purpose

This pull request includes changes to improve the handling of static files in the web application by modifying the Dockerfile and the Flask application routes. The most important changes include copying static files from the frontend build to a new directory and updating the routes to serve these files from the new location.

Changes to static file handling:

• App/WebApp.Dockerfile: Added commands to copy index.html and favicon.ico from the frontend build to the /usr/src/app/static/ directory.
• App/app.py: Updated the serve_index and favicon routes to serve files from the static directory instead of the frontend/build directory.
• App/app.py: Changed the route for serving static files from /assets/<path:path> to /static/<path:path> and updated the directory path accordingly.
• ...

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation - NA

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information