This PR creates a new test type for `run_tests.py` called `dart-host`. The tests remaining under the `dart` type are tests that run in `flutter_tester`. The `dart-host` tests run in the Dart CLI. This allows `run_tests.py` to be simplified a bit, and while doing this I spotted a couple of mistakes that were causing some tests not to run. This PR also makes a couple of small style fixes to the build config json files, converting tabs to spaces, and moving some "script" fields before the "parameters" fields.
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