Flutter tool should print adb error

[mit-mit]

When adb fails during a flutter run, we print the non-descriptive error:

Launching lib/main.dart on Android SDK built for x86 in debug mode...
Running 'gradle assembleDebug'...                    10.5s
Built build\app/outputs/apk/app-debug.apk (21.7MB).
Installing build\app/outputs/apk/app.apk...           0.8s
Error: ADB exited with exit code 1

adb itself has more descriptive errors:

adb.exe install C:\Users\mit\tmp\app200\build\app/outputs/apk/app-debug.apk
Failed to install C:\Users\mit\tmp\app200\build\app/outputs/apk/app-debug.apk:
Failure [INSTALL_FAILED_INSUFFICIENT_STORAGE]

Can we print those?

[mit-mit]

cc @tvolkert @jason-simmons

[tvolkert]

Yep, we should be able to get the stderr from the process and print it upon failure.

[github-actions]

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