Compass App: Integration tests and image error handling

[miquelbeltran]

This PR goes on top of PR #2385 adding integration test using the integration_test package.

Adds integration_test folder with two test suits:

• Local test: Uses the local dependency config that pulls data from the assets folder and has no login logic.
• Remote test: Starts the dart server in the background and uses the remote dependency config, pulls data from the server and performs login/logout.

To run the tests:

flutter test integration_test/app_server_data_test.dart

or

flutter test integration_test/app_local_data_test.dart

Running both at once with flutter test integration_test will likely fail, seems this issue is related: flutter/flutter#101031

Also, this PR fixes exceptions being thrown by the network image library, now instead they get logged using the app Logger.

Pre-launch Checklist

• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I read the Contributors Guide.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-devrel channel on Discord.

[ericwindmill]

LGTM