Turns out just supporting the right value for `kDebugMode` was a lot simpler than I thought. Debug builds used to never go through the build system code path when using `flutter run`, but now that we have wasm this can occur with the run command.
This should address https://github.com/flutter/flutter/issues/148850
The previous expression `success || line.contains('--- TEST FAILED ---')` made it such that as soon as success is reported, the test would send "q" on every line of stdout, which is wrong. This fixes the condition such that "q" is sent once, only when `--- TEST SUCCEEDED ---` or `--- TEST FAILED ---` is printed.
Move from `test.dart` into new `runner_utils.dart` file:
- shard calculation related methods + `shuffleSeed` logic
- env variable flag calculation
- runner wrapper methods `runDartTest` and `_runFromList`
Create web tests suite class containing:
- web long running tests
- runWebHtmlUnitTests
- runWebCanvasKitUnitTests
- runWebSkwasmUnitTests
- the associate helper methods with the above
