Fix `Manifest versionCode not found` (#1076)
Fix `Manifest versionCode not found` (#1076)

For each plugin, make sure example/android/app/build.gradle has proper versionCode/versionName setting. Henceforth, keep up with the `flutter create --template=plugin plugin_test` logic and solve a versionCode check problem introduced by https://github.com/flutter/flutter/commit/55f3da7af
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