* Skip integration tests that use flutter-tester on Windows

This is known to be broken. I will un-skip all of these once a fix for flutter-tester lands on Windows.

* Save with added import!

* Add tests to ensure flutter run does not quit at startup

These tests require https://github.com/dart-lang/vm_service_client/pull/38 to be merged and currently the third test (pause-on-exceptions) fails because of a bug.

* Remove TODO

Probably makes most sense this way for now.

* Address PR comments