[tool] Use `flutter` for pub commands when examples use Flutter (#11830) https://github.com/flutter/packages/pull/11797 changed the repo tooling to use `dart` instead of `flutter` for more commands when the target package isn't a Flutter package, include `pub downgrade` and `pub get` in `analyze`. However, since `pub get` will resolve any example apps, if any of *them* use Flutter, `dart pub get` will fail unless `dart` is coming from the Flutter SDK. Normally this is fine since that's the expected setup, but for the head-head tests in dart-lang that run the repo analysis using the head version of Dart via the `--analysis-sdk` flag, using that version of Dart for pub commands breaks things. This checks the example apps for Flutter dependencies to ensure that `dart pub` won't be used in cases where that can cause failures to resolve in the examples. This should be safe for core-packages, since core-packages should never use Flutter, even in examples.
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