Remove confusing printing of unresolved flutter SDK libraries

[annagrin]

Flutter adds a couple of libraries to the SDK which we currently cannot resolve correctly. The warnings do not affect anything except for setting breakpoints in those libraries. We should either resolve them properly or at least convert the warning to a lower level (ie logger.fine instead of logger.warning) so flutter does not print it in non-verbose mode.

See: flutter/flutter#101639:

Running "flutter pub get" in new_app...                            851ms
Launching lib/main.dart on Chrome in debug mode...
Waiting for connection from debug service on Chrome...              9.9s


DartUri: Unresolved uri: dart:web_sql     <- THIS
DartUri: Unresolved uri: dart:ui          <- AND THIS


This app is linked to the debug service: ws://127.0.0.1:62852/Jai_xCM6QR4=/ws
Debug service listening on ws://127.0.0.1:62852/Jai_xCM6QR4=/ws

💪 Running with sound null safety 💪

🔥  To hot restart changes while running, press "r" or "R".
For a more detailed help message, press "h". To quit, press "q".

An Observatory debugger and profiler on Chrome is available at: http://127.0.0.1:62852/Jai_xCM6QR4=
Flutter Web Bootstrap: Auto
The Flutter DevTools debugger and profiler on Chrome is available at: http://127.0.0.1:9101?uri=http://127.0.0.1:62852/Jai_xCM6QR4=