Add E2E automation in the bundle build to verify that all extensions are loaded into the function app.

[soninaren]

Currently we do not have any e2e test / validation on the extension bundle. We need to add end to end test to validate that the function app is able to load the newly built extension bundle, and all the extensions contained within the extension bundle.

Tasks.

1. Add a test function app to the extension bundle repo in the respective branches.
2. Add functions for each of the extension referenced in the extension bundle.
3. Add check to confirm the function app was able to start the function app and load all the extensions.